Swerve off course (4)
I believe the answer is:
veer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swerve off course</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for veer that I've seen before include "Swing around" , "Change direction or course, like wind" , "Swerve" , "Deviate" , "Sudden direction change" .)