Look to catch duck, large duck (9)
I believe the answer is:
goosander
'duck' is the definition.
(goosander is a kind of duck)
'look to catch duck large' is the wordplay.
'look' becomes 'gander' (informal term for a look or glance).
'to catch' is an insertion indicator.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'large' becomes 'os' (abbreviation for oversize).
'o'+'os'='oos'
'gander' placed around 'oos' is 'GOOSANDER'.
(Other definitions for goosander that I've seen before include "duck" , "Bird" , "Waterbird" .)