Mother with good pastry for flier (6)
I believe the answer is:
magpie
'flier' is the definition.
(magpie is a kind of birdanimal)
'mother with good pastry' is the wordplay.
'mother' becomes 'ma' (ma is a kind of mother).
'with' is a charade indicator (letters next to each other).
'good' becomes 'g' (abbreviation).
'pastry' becomes 'pie' (pie is a kind of pastry).
'ma'+'g'+'pie'='MAGPIE'
'for' is the link.
(Other definitions for magpie that I've seen before include "Black-and-white crow" , "Ominous bird if seen alone" , "A black-and-white thieving bird" , "Half of 1D [GAME OR BIRD]" , "'One is for sorrow, two for joy (6)'" .)