Vegetable produce a guy's on top of (9)
I believe the answer is:
mangetout
'vegetable' is the definition.
(I've seen this before)
'produce a guy's on top of' is the wordplay.
'produce' becomes 'getout' (I can't justify this - if you can you should give a lot more credence to this answer).
'a guy' becomes 'man' (guy can informally mean a man).
'on top of' means one lot of letters go next to another.
'getout' put after 'man' is 'MANGETOUT'.
Can you help me to learn more?
(Other definitions for mangetout that I've seen before include "something on the plate" , "Type of pea" , "Sugar peas" , "Vegetable" , "vegetables" .)