Indivisible (3)
I believe the answer is:
one
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">indivisible</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for one that I've seen before include "Sole; number" , "Unit" , "Single, sole" , "doesn't count for much" , "Figure" .)