Seesawed (8)
I believe the answer is:
teetered
'seesawed' is the definition.
('teeter' can be a synonym of 'seesaw')
This is all the clue.
(Other definitions for teetered that I've seen before include "wavered" , "Seesawed or vacillated" , "Moved unsteadily" , "Rocked on the edge" , "Tottered, on the brink say" .)