Key next to Q (3)
I believe the answer is:
tab
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">key next to q</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 tab that I've seen before include "Running bar bill" , "Flap; meal bill" , "Check" , "Small flap - bill" , "Tally of orders in bar" .)