Ready for a rendezvous with it (2,2,4)
I believe the answer is:
up to date
'with it' is the definition.
(both can mean modern)
'ready for a rendezvous' is the wordplay.
'ready for' becomes 'upto' (I've seen this in another clue).
'a rendezvous' becomes 'date' (a rendezvous is an appointment or date).
'upto'+'date'='UP-TO-DATE'
(Other definitions for up to date that I've seen before include "That's for girlfriend to decide" , "Trendy" , "Following modern trends" , "hip" , "absolutely fresh" .)