Worn thin (10)
I believe the answer is:
threadbare
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">worn thin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for threadbare that I've seen before include "Tired" , "Hackneyed" , "Frayed" , "the worse for wear" , "Well-worn" .)