Secret rendezvous (5)
I believe the answer is:
tryst
'secret rendezvous' is the definition.
(I've seen this in another clue)
This is all the clue.
(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" .)