Do up again (5)
I believe the answer is:
retie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">do up again</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 retie that I've seen before include "Bind again" , "make another knot" , "restore connection" , "Make knot or bow again" , "Link up again" .)