Duck removing foot from river (3)

I believe the answer is:

nil

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'duck' is the definition.
(both can mean zero)

I cannot understand how the rest of the clue works.

(Other definitions for nil that I've seen before include "Zero, no score" , "Nothing - in Latin" , "duck" , "Score of nought" , "You get nothing" .)

I've seen this clue in The Times.

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