Don't allow some of the destructive toys (4)
I believe the answer is:
veto
'don't allow' is the definition.
(I've seen this before)
'some of the destructive toys' is the wordplay.
'some of' indicates a hidden word.
'VETO' is hidden in the letters of 'destructive toys'.
(Other definitions for veto that I've seen before include "Right to reject a decision" , "Throw out" , "Right to reject a proposal" , "Stop" , "Right to prevent proposed action" .)