Crossword Genius

Number often reduced (3)

Ross

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'number' is the definition.
(ten is a number)

I don't understand how the remainder of the clue works.

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(Other definitions for ten that I've seen before include "How many" , "Dudley Moore/Bo Derek film" , "honour" , "X-WORD" , "PM's address, Downing St" .)

I've seen this clue in the Evening Standard.
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