Fishing nets (6)
'fishing nets' is the definition.
(trawl is a kind of fishing net)
This is all the clue.
(Other definitions for trawls that I've seen before include "Makes sweeping search as with net" , "Fishes by dragging a net through water" , "Fishes with large drag-net" , "Fishes with a net dragged through the water" .)
'fishing nets' is the definition.
(seine is a kind of fishing net)
This is all the clue.