Crossword Genius

Figures to reform most sinners (5)

Ross

I believe the answer is:

nines

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'figures' is the definition.

I cannot understand how the rest of the clue works.

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(Other definitions for nines that I've seen before include "In emergency, press three of these" , "9s" , "squares" , "Numbers to which one may be dressed up?" , "Dressed to these is to be perfectly turned out" .)

I've seen this clue in the Evening Standard.
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