Nest (5)
I believe the answer is:
eyrie
'nest' is the definition.
(I know that eyrie is a type of bird nest)
This is all the clue.
(Other definitions for eyrie that I've seen before include "Inaccessible spot" , "lofty house" , "home of 12 [RAPTOR]" , "Bird of prey's high nest" , "Lofty nest of a bird of prey" .)