Small seal (6)
I believe the answer is:
signet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small seal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(type of official seal)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for signet that I've seen before include "Official seal" , "Small seal sounds like a young swan" , "Ingest in ring" , "Tuft of hanging threads" , "Ingest (anag)" .)