Number present (10)
I believe the answer is:
attendance
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">number present</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 attendance that I've seen before include "Presence; gate" , "Number at gathering" , "all that turned up" , "how many are watching?" , "People present" .)