Modicum, iota (3)
I believe the answer is:
tad
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">modicum</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">iota</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for tad that I've seen before include "Small bit" , "Modest amount" , "Slight amount" , "(A) bit, touch" , "Smidgen" .)