Ring of a chain (4)
I believe the answer is:
link
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ring of a chain</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 link that I've seen before include "Connect" , "Join together" , "Relationship; loop in a chain" , "Join; loop in a chain" , "Connexion" .)