Risk not starting walk (5)
I believe the answer is:
amble
'walk' is the definition.
(I know that amble is a type of walk)
'risk not starting' is the wordplay.
'risk' becomes 'gamble' (synonyms).
'not starting' means to remove the first letter.
'gamble' with its initial letter removed is 'AMBLE'.
(Other definitions for amble that I've seen before include "Wander gently along" , "Walk along slowly" , "Walk gently" , "Casual walk" , "Walk at an easy pace" .)