Balance unsteadily (6)
I believe the answer is:
teeter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">balance unsteadily</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for teeter that I've seen before include "Totter, wobble" , "Rock unsteadily on edge" , "Sway back and forth on the edge" , "Sway, as if about to fall" , "Wobble on the brink" .)