Bird, fiery duck (8)
I believe the answer is:
flamingo
'bird' is the definition.
(flamingo is a kind of bird)
'fiery duck' is the wordplay.
'fiery' becomes 'flaming' ('flaming' can be a synonym of 'fiery').
'duck' becomes 'o'.
'flaming'+'o'='FLAMINGO'
(Other definitions for flamingo that I've seen before include "Tall wading bird" , "Pink flier" , "Large pink bird" , "Pretty bird" , "Pink wading-bird" .)