In France, I team up with criminal moguls regularly suspicious of rivalry? (7)

I believe the answer is:

jealous

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'in' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for jealous that I've seen before include "Showing envious resentment" , "Envious, covetous" , "Green" , "Envious of another" , "Resentful" .)

I've seen this clue in The Irish Times.

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