Safe to criticise play? (5,3)
I believe the answer is:
peter pan
'play?' is the definition.
(I know that Peter Pan is a play)
'safe to criticise' is the wordplay.
'safe' becomes 'peter' (slang term for a safe).
'to criticise' becomes 'pan' (informal term meaning to criticise heavily).
'peter'+'pan'='PETER PAN'
(Other definitions for peter pan that I've seen before include "voyager to Never Never Land" , "Musical from Barrie play" , "J M Barrie's ever-young boy" , "Youth forever" , "JM Barrie character" .)