PM (9)
I believe the answer is:
afternoon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pm</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for afternoon that I've seen before include "half a day?" , "Latter part of daylight hours" , "PM includes this" , "Then it's early in this!" , "No ante for this part of the day" .)