Hoover, informally (3)
I believe the answer is:
vac
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hoover informally</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 vac that I've seen before include "short holiday" , "Holiday; cleaner" , "which helps with housework" , "Break" , "brief holiday" .)