Jealousy caused by overindulgence? (12)

I believe the answer is:

heartburning

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This could be a double definition.

'jealousy' is the first definition.
The answer and definition can be both feelings as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'overindulgence?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'caused by' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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