Homes in trees (5)
I believe the answer is:
nests
'homes in trees' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nests that I've seen before include "Bird structures" , "Places to rear the young?" , "Settles comfortably into, as birds do" , "Structures for egg-laying" , "Structures for laying eggs" .)