Gradient, incline (5)
I believe the answer is:
slope
This clue is a double definition.
'gradient' is the first definition.
(I know that gradient can be written as slope)
'incline' is the second definition.
(I know that incline can be written as slope)
(Other definitions for slope that I've seen before include "Rev Obadiah" , "Slant" , "Be inclined" , "Inclination" , "Rake; Barchester chaplain" .)