Fishing boat (7)
I believe the answer is:
trawler
'fishing boat' is the definition.
(I know that trawler is a type of fishing boat)
This is all the clue.
(Other definitions for trawler that I've seen before include "Boat that fishes with nets" , "seagoing vessel" , "Fishing vessel that drags nets behind it" , "Fishing boat that uses nets" , "Type of fishing boat" .)