Walk for weeks (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 walk)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for march that I've seen before include "Colonel Bogey, for example" , "Walk in a resolute manner" , "that happens fairly early each year" , "Stride; month" , "Walk smartly" .)

I've seen this clue in the Evening Standard.

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