Seesaw (6)
I believe the answer is:
teeter
'seesaw' is the definition.
(I know that seesaw can be written as teeter)
This is all the clue.
(Other definitions for teeter that I've seen before include "Hesitate on the brink" , "Vacillate" , "Rock unsteadily on edge" , "Sway, as if about to fall" , "Totter, wobble" .)