Monkey one for breaded prawns (6)
I believe the answer is:
scampi
'breaded prawns' is the definition.
(I've seen this before)
'monkey one' is the wordplay.
'monkey' becomes 'scamp' (both can mean a mischievous child).
'one' becomes 'i' (Roman numeral).
'scamp'+'i'='SCAMPI'
'for' acts as a link.
(Other definitions for scampi that I've seen before include "Prawns, usually fried" , "Prawn dish" , "Cooked Norway lobster" , "Breaded prawns" , "Norway lobsters -- Dublin Bay prawns" .)