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Fats Waller treated, removing small cataract (9)

Ross

I believe the answer is:

waterfall

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'cataract' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for waterfall that I've seen before include "source of power, possibly a force in the north" , "Perpendicular descent of a river" , "Such as Niagara" , "Downpour" , "Cataract" .)

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