Quartet quorum (4)
I believe the answer is:
four
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quartet quorum</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 four that I've seen before include "Cube root of 64" , "10 cleared of misuse of fortune" , "Rowing boat; number" , "teatime?" , "Two squared" .)