Turn abruptly (6)
I believe the answer is:
swerve
'turn abruptly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for swerve that I've seen before include "Turn sharply aside" , "Suddenly go off course" , "Veer wildly" , "Deviate from the straight path" , "Change course violently" .)