Deviated (5)
I believe the answer is:
yawed
'deviated' is the definition.
(yawing is a kind of deviating)
This is the entire clue.
(Other definitions for yawed that I've seen before include "turned to the left perhaps" , "Of ship, failed to hold a straight course" , "Deviated erratically from the course" , "Zigzagged" .)