Red fir, it's badly cooked (4-5)
I believe the answer is:
stir-fried
'cooked' is the definition.
(stir-frying is a type of cooking)
'red fir it's badly' is the wordplay.
'badly' is an anagram indicator (letters in the wrong order).
'red'+'fir'+'its'='redfirits'
'redfirits' anagrammed gives 'STIR-FRIED'.
(Other definitions for stir-fried that I've seen before include "Cooked by whisking rapidly in hot pan" , "Drifter is given food cooked and whisked in pan" , "Drifter is attracted to food whisked in pan" , "Cooked in a wok" , "Cooked quickly over high heat" .)