Small flap; tally (3)
I believe the answer is:
tab
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">small flap</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">tally</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for tab that I've seen before include "Tally at bar (colloq.)" , "Ring pull" , "Tally of orders in bar" , "Tag" , "Kind of label for bat" .)