Wig plan revised for bird (7)
I believe the answer is:
lapwing
'for bird' is the definition.
(lapwing is a kind of bird)
'wig plan revised' is the wordplay.
'revised' indicates an anagram.
'wig'+'plan'='wigplan'
'wigplan' anagrammed gives 'LAPWING'.
(Other definitions for lapwing that I've seen before include "Type of plover" , "Plover, pewit" , "Variety of plover" , "Flier" , "high-flier" .)