Walks on the small inclines (6)
I believe the answer is:
tramps
'walks' is the definition.
(tramp is a kind of walk)
'on the small inclines' is the wordplay.
'on' means one lot of letters go next to another.
'the small' becomes 't' (the is pronounced as a 't' sound in some dialects; 'small' asks for a short form).
'inclines' becomes 'ramps' ('ramp' can be a synonym of 'incline').
't' next to 'ramps' is 'TRAMPS'.
(Other definitions for tramps that I've seen before include "Walks with heavy footfall" , "Walks heavily like hoboes" , "Stumps" , "Become hard or solid" , "Homeless people" .)