Secret meeting to get crack on street (5)
I believe the answer is:
tryst
'secret meeting' is the definition.
(tryst can mean a secret meeting between lovers)
'crack on street' is the wordplay.
'crack' becomes 'try' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other).
'street' becomes 'st' (abbreviation).
'try'+'st'='TRYST'
'to get' acts as a link.
(Other definitions for tryst that I've seen before include "cattle-fair" , "(Secret) meeting between lovers" , "Secret assignment" , "Romantic assignation" , "Romantic meeting" .)