Play date participant (3)
I believe the answer is:
tot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">play date participant</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 tot that I've seen before include "slug?" , "Palindrome for small child" , "Drop" , "Calculate" , "Aggregate for infant" .)