Swung, nautically (5)
I believe the answer is:
yawed
'swung nautically' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yawed that I've seen before include "Zigzagged" , "Of ship, failed to hold a straight course" , "Deviated erratically from the course" , "turned to the left perhaps" .)