Resistance with some current inclination (4)
I believe the answer is:
ramp
'inclination' is the definition.
(an inclined surface)
'resistance with some current' is the wordplay.
'resistance' becomes 'r' (electronics abbreviation).
'with' says to put letters next to each other.
'some current' becomes 'amp' (unit of electrical current).
'r'+'amp'='RAMP'
(Other definitions for ramp that I've seen before include "Inclined path" , "Change of level in road" , "Slope - racket" , "Wheelchair access?" , "Smoothed-out stairs" .)