Crossword Genius

Foul now, unfit for consumption (2-3)

Ross

I believe the answer is:

in-off

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'foul' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for in-off that I've seen before include "Billiards/snooker shot" , "Foul (snooker), scoring stroke (billiards)" , "Shot that's good at billiards and foul at snooker" , "Pocketing of a snooker ball via a deflection" , "Snooker hazard" .)

I've seen this clue in The Times.
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