Crossword Genius

Out of the red solvent (2,3,5)

Ross

I believe the answer is:

in the black

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'solvent' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for in the black that I've seen before include "Solvent; out of debt" , "Funeral directors are usually" , "Having money" , "able to pay debts" , "Where roulette ball may land" .)

I've seen this clue in the Sydney Morning Herald.
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