Headless duck's walk to confuse (5)

I believe the answer is:

addle

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'to confuse' is the definition.
(I know that addle is a kind of confuse)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for addle that I've seen before include "(Of eggs) turn bad" , "becomes muddled" , "confusing" , "Go rotten" , "Confuse; become rotten" .)

I've seen this clue in the Sydney Morning Herald.

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