Pulled thread
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pulled thread</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for snag that I've seen before include "Sharp protuberance; catch" , "Jag" , "Minor hitch" , "Hitch, unexpected problem" , "Stumbling block" .)