Humberside fishing port (7)
I believe the answer is:
grimsby
'humberside fishing port' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for grimsby that I've seen before include "Lincs port" , "East Coast port" , "Seaport on the Humber estuary" , "Humberside fishing port" , "Lincolnshire port" .)