Fish with a large net (5)
I believe the answer is:
trawl
'fish with a large net' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trawl that I've seen before include "search for a suitable appointment" , "Net for fishing at sea" , "fishing expedition" , "Net dragged behind fishing boats" , "Fish commercially with nets" .)