Fastening, knotting (5)
I believe the answer is:
tying
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">fastening</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that tying is a type of fastening)</span><br/ ><br/ >'<span class="explanation-format__original">knotting</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for tying that I've seen before include "Scoring the same" , "Linking" , "restrictive" , "Binding, fastening" , "lacing" .)