Clip wings of enormous wading birds (6)
I believe the answer is:
snipes
'wading birds' is the definition.
(snipe is a kind of wading bird)
'clip wings of enormous' is the wordplay.
'clip' becomes 'snip' (synonyms).
'wings of' means to remove the middle letters (letters on the two wings removed).
'enormous' with its middle removed is 'es'.
'snip'+'es'='SNIPES'
(Other definitions for snipes that I've seen before include "Puts down" , "Fires from place of concealment" , "Petty verbal attacks on the wading birds" , "Shoots from a concealed position - at birds of marshy areas?" .)