Tire out (7)
I believe the answer is:
exhaust
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tire out</span>' is the definition.<br/ ><span class="explanation-format__explanation">(exhausting is a kind of tiring out)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for exhaust that I've seen before include "Weary" , "Waste gas from engine" , "Deplete" , "Use up completely" , "Wear, tire out" .)