A rocky walk (6)

I believe the answer is:

waddle

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for waddle that I've seen before include "Walk duck-fashion" , "Walk like duck, fat man" , "Walk with clumsily swaying motion" , "Move like a duck" , "Clumsy swaying walk" .)

I've seen this clue in the Evening Standard.

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