Seal (6)
I believe the answer is:
signet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(signet is a kind of seal)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for signet that I've seen before include "Tinges (anag) - seal" , "Official seal" , "Small seal - type of ring" , "Little seal" , "'Seal, on a ring say (6)'" .)