Draw aimlessly (6)
I believe the answer is:
doodle
'draw aimlessly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for doodle that I've seen before include "Scribble meaninglessly, fiddle with pen" , "Aimless scribble" , "Scribble aimlessly or absent-mindedly" , "Casual drawing" , "Draw aimlessly" .)