Exercised (7)
I believe the answer is:
exerted
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exercised</span>' is the definition.<br/ ><span class="explanation-format__explanation">('exert' can be a synonym of 'exercise')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for exerted that I've seen before include "Made a great physical effort" , "Brought to bear, influence perhaps" .)