Deviation at sea (3)

I believe the answer is:
yaw
'deviation at sea' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yaw that I've seen before include "Ship's deviation" , "Deviation (of e.g. ship)" , "(Of ship) twist sideways" , "Temporarily get off course" , "Twisting motion (of ship)" .)