My first impulse was to post something mildly taking the mickey by suggesting Lahiff’s campsite or the wilds of Spanish Point carpark t opitch a tent

I thought the better of it though.
Nothing in Ireland comes cheap, accomodation during the summer least of all.
Just some random thoughts on the rest of your project:
There’s two ways you can go about a project like this: 1. you take the money and go on the piss for six weeks and talk to a few people you meet at the local gig-session and write a report based on that or 2. you prepare yourself, get to know about Clare music if you’re going to be there, and make a bit of a plan about what pivotal musicians want to see and what to talk about with them. It’s probably wise to give a bit of notice and check if the people you want to see have time for you rather than to arrive on the doorstep, summer is a busy time and well, you won’t be the only summer visitor on a mission.
Nine or ten years ago for example I had a visit from a German girl who had managed to get a grant to do a paper on Irish music. In fact she was dumped on me by the woman of her B&B who was anxious to be rid of her. Anyway she had no clue about Irish music at all, really nothing at all although she said she was really into it and offered to sing the Star of the Co Down to her own guitar playing. She never read, or even heard of, the basic introductions like Breandan Breathnach’s Folk music and Dances or Tomas O Canainn book let alone having any awareness of the basics written about in these books.
That really was a waste of time. Avoid putting people in a situation like that.
Some years ago (and I think I mentioned this episode on the forums at the time) I was in town on a sunny afternoon, it must have been a friday around two, all the pensioners were in town doing their shopping. Anyhow, I ran into Kitty Hayes, had a chat and we were soon joined by piper Michael Falsey and singer Michael Haren, JC Talty was taking a bit of the sunshine leaning against a wall a bit further up the street and Jackie Daly drove by in his Nissan Micra hooting the horn and shouting something at us. Meanwhile right across the street three obviously English tourists were throwing their banjo Bodhran and accordeon in the boot of their car after a quick stroll around the pubs on the mainstreet, saying ‘let’s go to Doolin there’s obviously no music in this dump’ (yeah right, two O clock on the friday afternoon, what would you expect). I mean, there’s music there but you will have to know where to find it, it won’t come out to meet you on arrival and if you don’t know the local musicians you may pass them by without ever knowing they were there at all.
The way your question is phrased shows there’s a bit of a gap between your expectations and the realities of (rural) Ireland. You will need to prepare a bit more and if you don’t have wheels : expect to walk long distances, in soft drizzle most likely. So bring the wellies and the raincoat.
The Willie Clancy Summer school publishes a list of accomodation, usually around the end of march/april, look at their website for more information.
Oidreacht an Clar runs a few short courses around the time of the Willie Clancy week that may be useful to you look at www.oac.ie
More practical and more of a comhaltas affair is the Meitheal Summer School, this year july 16-20 but in Limerick www.tradweek.com