Tennis call (3)
I believe the answer is:
let
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tennis call</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 let that I've seen before include "Allow; tennis fault" , "Rent out (property)" , "Allow on the tennis court" , "Won't stop you" , "Allow or lease" .)