Crossword Genius

Chance to forgo start of gruelling walk (5)

Ross

I believe the answer is:

amble

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'walk' is the definition.
(ambling is a kind of walking)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for amble that I've seen before include "Wander casually" , "Blame for leisurely walk" , "Casual walk" , "Swan" , "Dawdle" .)

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