Became frayed (4)
I believe the answer is:
wore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">became frayed</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 wore that I've seen before include "Eroded" , "Was clad in" , "Was clothed in" , "Was dressed in" , "Wear's past" .)