Sudden wind jostled vessels in harbour (4)
I believe the answer is:
tugs
'vessels in harbour' is the definition.
'tugs' can be an answer for 'vessels' (tug is a kind of vessel). I am unsure of the 'in harbour' bit.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tugs that I've seen before include "Yanks" , "Tows" , "Pulls hard" , "Pulls in a jerking manner" .)