A rhythmic walk? (5)

I believe the answer is:

march

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'walk?' is the definition.
(I know that march is a more specific form of the action the walk)

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

Can you help me to learn more?

(Other definitions for march that I've seen before include "Colonel Bogey, for example" , "Journey undertaken by army etc" , "Walk smartly" , "The month for military movement" , "Proceed in procession" .)

I've seen this clue in the Evening Standard.

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