I rediscovered a compilation of that great Irish songwriter when I was flipping through my old vinyls lately. A goldmine of beautiful arrangements and wonderful songs which occupies my turntable (and iPod) permanently. "Clair" is definitely my favorite, but I will try to figure out one or two more.
You will find that I did not tab out the song fully. It is just the melody and the chord root notes. First, I find that this beautiful melody requires some space. Second, I play the rhythm quite freely and very sparsely. So feel encouraged to find your own groove to it. In all, it is not so tough, except for that Cdim7 chord in the second part. I added a chord chart the way I play it, of course there are many other ways.