Incline not to start walk (4)
I believe the answer is:
lope
'walk' is the definition.
'incline not to start' is the wordplay.
'incline' becomes 'slope' (synonyms).
'not to start' means to remove the first letter.
'slope' with its initial letter taken off is 'LOPE'.
(Other definitions for lope that I've seen before include "Run boundingly" , "Move with long strides" , "Run with long bounding steps" , "Slow pace" , "Move with a long bounding stride" .)