Secret rendezvous (5)
I believe the answer is:
tryst
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">secret rendezvous</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tryst that I've seen before include "An archaic lovers' meeting" , "Romantic rendezvous (literary)" , "private meeting" , "Lovers' assignation" , "Pre-arranged (secret) meeting" .)