About half a month (9)
I believe the answer is:
fortnight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">about half a month</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 fortnight that I've seen before include "short period?" , "Two weeks" , "Period of time" , "Half a lunar month" , "couple of weeks" .)