Toast cooked for animal (5)
I believe the answer is:
stoat
'for animal' is the definition.
(type of rodent)
'toast cooked' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'toast' is an anagram of 'STOAT'.
(Other definitions for stoat that I've seen before include "furry animal" , "Weasel-like mammal" , "Eating rabbit, he" , "European ermine" , "Short-tail weasel" .)