Crossword Genius

The necessary ins and outs? (4,4)

Ross

I believe the answer is:

cash flow

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This might be a double definition.

'the necessary' is the first definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

'ins and outs?' is the second definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for cash flow that I've seen before include "business's finances" , "Movement of money" , "liquidity issue?" , "A must for solvent businesses" , "Movement of rhino" .)

I've seen this clue in The Independent.
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