Walker without jacket on walk (5)

I believe the answer is:

amble

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'walk' is the definition.
(I know that amble is a type of walk)

I don't understand how the rest of the clue works.

(Other definitions for amble that I've seen before include "Blame for slow walk" , "Walk in a leisurely way" , "Dawdle" , "Go at a leisurely gait" , "Make slow progress" .)

I've seen this clue in The Sunday Times.

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