Dot on a die (3)
I believe the answer is:
pip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dot on a die</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 pip that I've seen before include "Philip" , "Dickens hero" , "Mark of rank" , "Great Expectations hero" , "Dickensian hero" .)