Word with bird or nest (4)
I believe the answer is:
love
'word with bird or nest' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for love that I've seen before include "Zero score (it's all you need)" , "Vole (anag.)" , "powerful emotion" , "See 23" , "like very much?" .)