Make less loose (7)
I believe the answer is:
tighten
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make less loose</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tighten that I've seen before include "increase tension" , "Constrict" , "Make less loose" , "Restrict" , "Make more restrictive" .)