Drive with parking on slope (4)
I believe the answer is:
ramp
'slope' is the definition.
(I've seen this before)
'drive with parking' is the wordplay.
'drive' becomes 'ram' (RAM drive on a computer).
'with' means one lot of letters go next to another.
'parking' becomes 'p' (abbreviation on road signs).
'ram'+'p'='RAMP'
'on' acts as a link.
(Other definitions for ramp that I've seen before include "It gets travellers off" , "Inclined path" , "Sloping platform" , "Sloping path between levels" , "Inclined walkway" .)