Loosened, opened (5)
I believe the answer is:
undid
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">loosened</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">opened</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 undid that I've seen before include "Released" , "Cancelled - destroyed" , "Cancelled, reversed (an action)" , "solved knotty problem" , "Reversed, destroyed" .)