"Shall we?" response (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shall we? response</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 lets that I've seen before include "Allows or causes to" , "Yes" , "Permits" , "Leases" , "we shall serve them again!" .)