Half a dozen (3)
I believe the answer is:
six
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">half a dozen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that half a dozen can be written as six)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for six that I've seen before include "Maximum cricket hit" , "Number of bowls in a cricket over" , "larger boundary" , "VI" , "Knock for . . . - surprise or defeat" .)