Is monkey allowed to nibble on this? (6)
I believe the answer is:
canape
'allowed to nibble on this?' is the definition.
The definition suggests a singular noun which matches the answer.
'is monkey' is the wordplay.
I cannot really see how this works, but
'monkey' could be 'ape' (I've seen this before) and 'ape' is found in the answer.
The remaining letters 'can' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for canape that I've seen before include "Piece of finger food" , "Small savoury on toast or bread" , "Small biscuit with savoury on top" , "Finger food for parties" , "Savoury snack" .)