Fish dad cooked in white wine (7)
I believe the answer is:
haddock
'fish' is the definition.
(haddock is a kind of fish)
'dad cooked in white wine' is the wordplay.
'cooked' indicates an anagram.
'in' is an insertion indicator.
'white wine' becomes 'hock' (hock is a kind of white wine).
'dad' with letters rearranged gives 'add'.
'add' placed into 'hock' is 'HADDOCK'.
(Other definitions for haddock that I've seen before include "Fish similar to but smaller than cod" , "Cod-like fish" , "Swimmer" , "ish" , "Popular food fish" .)