Devours a set recipe (4)
I believe the answer is:
eats
'devours' is the definition.
(I've seen this before)
'a set recipe' is the wordplay.
'recipe' is an anagram indicator.
'a'+'set'='aset'
'aset' is an anagram of 'EATS'.
(Other definitions for eats that I've seen before include "Food (slang)" , "fare" , "Swallows food" , "Munches" , "(Consumes) food" .)