Tripped (8)
I believe the answer is:
stumbled
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tripped</span>' is the definition.<br/ ><span class="explanation-format__explanation">('stumble' can be a synonym of 'trip')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stumbled that I've seen before include "Lost balance in walking or speaking" , "Momentarily tripped" , "Lost one's footing" , "Missed a step and almost fell" , "Tripped, faltered" .)