Cherry pie stuffed with small bird (8)
I believe the answer is:
redstart
'bird' is the definition.
(type of bird)
'cherry pie stuffed with small' is the wordplay.
'cherry' becomes 'red' (synonyms).
'pie' becomes 'tart' (I've seen this before).
'stuffed with' is an insertion indicator (some letters get stuffed inside).
'small' becomes 's' (abbreviation - e.g. clothes size).
'red'+'tart'='redtart'
'redtart' going around 's' is 'REDSTART'.
(Other definitions for redstart that I've seen before include "Songbird" , "Bird (coloured opening!)" , "Half of 1D [GAME OR BIRD]" , "winger" , "Singer" .)