Bird in summer nesting-place (4)
I believe the answer is:
erne
'bird' is the definition.
(erne is a kind of bird)
'in summer nesting-place' is the wordplay.
'in' indicates a hidden word.
'ERNE' is hidden in the letters of 'summer nesting place'.
(Other definitions for erne that I've seen before include "flyer in the main" , "A high-flier" , "Light (a flame)" , "Island-studded lake in Fermanagh" , "Marine flyer" .)