It's confusing how to make duck smaller yet bigger (7)

I believe the answer is:

addling

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

I can't explain the remainder of the clue.

(Other definitions for addling that I've seen before include "Taking order from" , "Becoming rotten" .)

I've seen this clue in The Telegraph.

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