Under-the-table payment (5)
I believe the answer is:
bribe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">under-the-table payment</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 bribe that I've seen before include "Corrupt payment" , "Sop" , "Illegal incentive" , "Oil the palm (of)" , "Dishonestly persuade" .)