Nearly finished, just three in the top left hand corner to do - 1d, 2d and 11ac. I think I have an answer for 2d, but can't parse it.
1d Tree competitor polled (4) I have ?C??
2d Book fair, fair! (6) I have ?R???T
11ac Jamaican music, pattern of notes around ghetto originally (5) ????A
I'm assuming the Jamaican music might be Ska, but I've just got 1d so 11ac begins with an R, so maybe its a corruption of reggae.