Cook got pea soup (6)
I believe the answer is:
potage
'soup' is the definition.
(potage is a kind of soup)
'cook got pea' is the wordplay.
'cook' indicates anagramming the letters.
'got'+'pea'='gotpea'
'gotpea' is an anagram of 'POTAGE'.
(Other definitions for potage that I've seen before include "which is fairly thick" , "this spoon-fed?" , "French soup, usually thick" , "> sort of liquid nourishment" , "that's thick" .)