Zig and zag (7)
I believe the answer is:
meander
'zig and zag' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for meander that I've seen before include "Roam aimlessly around" , "Indirectly move" , "Wander idly" , "Snake" , "Wander aimlessly like a stream" .)