Cook a chop badly (5)
I believe the answer is:
poach
'cook' is the definition.
(I know that poach is a kind of cook)
'a chop badly' is the wordplay.
'badly' indicates an anagram (letters in the wrong order).
'a'+'chop'='achop'
'achop' anagrammed gives 'POACH'.
(Other definitions for poach that I've seen before include "Cook in boiling liquid - steal game" , "Take game illegally from land or water" , "Track down" , "Appropriate" , "Cook (an egg) in water" .)