Crossword Genius

Complex fix improving when leads are crossed (4-7)

Ross

I believe the answer is:

mind-bending

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'complex' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for mind-bending that I've seen is " Hallucinatory".)

I've seen this clue in The Times.
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