Knot; obligation (3)
I believe the answer is:
tie
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">knot</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that knot is a more specific form of the action bind)</span><br/ ><br/ >'<span class="explanation-format__original">obligation</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for tie that I've seen before include "Equality of score" , "A draw or male neckwear" , "Stalemate" , "line above notes" , "Draw; link" .)