Perry maybe with plum as one ingredient (5)
I believe the answer is:
Here is my best explanation:
'perry maybe' is the definition.
(fictional detective Perry Mason)
'with plum as one ingredient' is the wordplay.
'with' indicates a hidden word.
'MASON' can be found hidden inside 'plum as one ingredient'.
(Other definitions for mason that I've seen before include "member of charitable society", "Secret society member", "A worker with stone, may be Free", "Society member", "Builder in stone", "figure in lodge", "Jewish comedian", "Stone worker", "He works with stone - may be free" and "Stone-worker".)