A bird that may be eaten hot or cold (3)
I believe the answer is:
pie
'a bird' is the definition.
(sort of bird)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for pie that I've seen before include "Pastry-covered dish" , "Covered tart" , "welcome luxury" , "Bird - dish - mixed type" , "steak might go in this" .)