Identifying sign (5)
I believe the answer is:
badge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">identifying sign</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for badge that I've seen before include "Symbol worn, to indicate membership perhaps" , "Emblem of office" , "Emblem, to symbolise membership perhaps" , "Emblem of belonging" , "Form of identification" .)