Shot over the street for an appointment (5)
I believe the answer is:
tryst
'an appointment' is the definition.
(tryst is a kind of appointment)
'shot over the street' is the wordplay.
'shot' becomes 'try' (I've seen this in other clues**).
'over' says to put letters next to each other.
'the street' becomes 'st'.
'try'+'st'='TRYST'
'for' is the link.
(Other definitions for tryst that I've seen before include "Romantic rendezvous (literary)" , "Romantic meeting" , "where lovers meet" , "Lump (of gold, etc)" , "Secret assignation" .)