Bird is found in hide (6)
I believe the answer is:
siskin
'bird' is the definition.
(siskin is a kind of bird)
'is found in hide' is the wordplay.
'found in' is an insertion indicator.
'hide' becomes 'skin' ('skin' can be a synonym of 'hide').
'is' inserted within 'skin' is 'SISKIN'.
(Other definitions for siskin that I've seen before include "Yellow-green finch" , "Yellow-and-black finch" , "Small bird - kiss in (anag)" , "Greenish songbird related to Goldfinch" , "Winger" .)