38d, top expert had finally turned up to open very good gallery (10) I have ?E???ITATE...Tate being the good gallery, I assume, but can't work out the rest.
Stuck on 25d, carry out death sentence on train going to london (6,2) and 37a, hearing of clan that's captured one (8). Think 25d might be string up but can't parse it...just a guess.