We'd go in to disturb the bird (7)
I believe the answer is:
widgeon
'bird' is the definition.
(widgeon is a kind of bird)
'we'd go in to disturb' is the wordplay.
'to disturb' indicates anagramming the letters (I've seen 'disturbed' mean this (the order of letters is disturbed)).
'wed'+'go'+'in'='wedgoin'
'wedgoin' with letters rearranged gives 'WIDGEON'.
'the' is the link.
(Other definitions for widgeon that I've seen before include "Duck with pointed wings and wedge-shaped tail" , "Freshwater duck - wine god (anag)" , "Type of duck" , "Owed gin (anag) - duck" , "Eurasian duck" .)