Vagrant seen before parking vehicle (5)
I believe the answer is:
tramp
'vagrant' is the definition.
(I know that vagrant can be written as tramp)
'before parking vehicle' is the wordplay.
'before' is a charade indicator (letters next to each other).
'parking' becomes 'p' (abbreviation on road signs).
'vehicle' becomes 'tram' (tram is a kind of vehicle).
'p' after 'tram' is 'TRAMP'.
'seen' acts as a link.
(Other definitions for tramp that I've seen before include "Derelict - ship" , "Vagrant, drifter" , "Tread heavily (on)" , "Walk heavily - steamer" , "Live as a vagrant" .)