Cut off in berth (4)
I believe the answer is:
dock
I believe this clue is a double definition.
'cut off' is the first definition.
(thesaurus)
'berth' is the second definition.
(I've seen this in another clue)
'in' acts as a link.
(Other definitions for dock that I've seen before include "Cut < sort of brief" , "Boat mooringd" , "Quay" , "Remove or shorten an animal's tail" , "Cut short; coarse weed" .)