Poles’ new inclination (5)
I believe the answer is:
slope
'inclination' is the definition.
(I've seen this before)
'poles' new' is the wordplay.
'new' indicates an anagram.
'poles' anagrammed gives 'SLOPE'.
(Other definitions for slope that I've seen before include "Be inclined" , "Slant" , "A rise, possibly" , "Rake; Barchester chaplain" , "Tilt with poles" .)