Fish and fruit only (5,4)
I believe the answer is:
lemon sole
'fish' is the definition.
(I know that lemon sole is a type of sole)
'fruit only' is the wordplay.
'fruit' becomes 'lemon' (lemon is a kind of fruit).
'only' becomes 'sole' (synonyms).
'lemon'+'sole'='LEMON-SOLE'
'and' is the link.
(Other definitions for lemon sole that I've seen before include "Lose melon, find kind of plaice" , "swimmer" , "Another tasty flatfish like lone citrus fruit" , "fish to eat" , "Flatfish, valued as food" .)