Confuse movement of a duck with taking off (5)

I believe the answer is:

addle

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'confuse' is the definition.
(addling is a kind of confusing)

I cannot understand how the rest of the clue works.

(Other definitions for addle that I've seen before include "Go rotten" , "(Of eggs) become rotten" , "confusing" , "Get confused" , "Scramble" .)

I've seen this clue in The Independent.

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