Inclination I granted, perhaps (8)
I believe the answer is:
gradient
'inclination' is the definition.
(a tilted or angled slope)
'i granted perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'i'+'granted'='igranted'
'igranted' is an anagram of 'GRADIENT'.
(Other definitions for gradient that I've seen before include "Level of steepness" , "Measure of slope" , "Angle of slope" , "Bank" , "Third OT book" .)