Solvers! I think this one's moderately tricky, so thanks for trying it, and do let me know how you got on. Here's the wash-up for any you didn't catch:
ACROSS 1A1ATraitor below decks initiated blast (5)[----]. Traitor = RAT, after "decks" initiated = D. 5A5AArsenal's finest hack making a comeback (5)[-----]. Reversal of: finest = TOP + hack (journalist) = ED. 7A7AGnome that makes cuts (3)[---]. Double def. 8A8ACried out for a fruity drink (5)[-----]. anag. CRIED 9A9AObsessive study returned, accepting first of revisions (4)[----]. reversal of study = DEN, over first of "revisions" = R. DOWN 2D2DGo wrong again, with this sappy stuff (5)[-----]. Go wrong again = RE-SIN. 3D3DDrag Queen Liz - a high point! (5)[-----]. Drag = TOW + Queen Liz = ER. 4D4DPorridge mix (4)[----]. Double def. (Porridge and stir are both UK slang for prisons.) 5D5DBob or Donald, perhaps? (4)[----]. Double def. 6D6DProtective father and daughter (3)[---]. father = PA + daughter = D.