Aerie resident (6)
I believe the answer is:
eaglet
'aerie resident' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eaglet that I've seen before include "young flier?" , "Get ale for the young bird" , "One hatched in eyrie" , "A young bird of prey, lives in eyrie" , "Raptor chick" .)