Go this way, then that (6)
I believe the answer is:
zigzag
'go this way then that' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for zigzag that I've seen before include "Sharp turning" , "Pattern of short, sharp turns" , "Move first one way, then the other" , "Meandering course" , "Make sharp turns" .)