Lee Mack cooked, ate right fish (8)
I believe the answer is:
mackerel
'fish' is the definition.
(mackerel is a kind of fish)
'lee mack cooked ate right' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'ate' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'lee'+'mack'='leemack'
'leemack' anagrammed gives 'mackeel'.
'mackeel' going around 'r' is 'MACKEREL'.
(Other definitions for mackerel that I've seen before include "Banded food fish" , "Common striped fish, very tasty" , "One in school" , "Oily food fish" , "Edible fish" .)