Thanks everyone - now know Curare is an arrow poison - will try to remember that!
Still can't solve last one 20d Couple with a jacket on, I gathered (6) _ D _ O _E
The E at the end could be wrong - the clue was 28a Enormous bottom (S) on cute (WEE) figure? Sugar! So I thought it was SWEETIE but wasn,t sure about the TIE bit.
Other two letters are correct