Thus brood may commit coronary consumption on you! (3,4,5,3)

I believe the answer is:

eat your heart out

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'thus brood may commit coronary consumption' is the definition.
I know nothing about this answer so I can't tell whether this works.

'on you' is the wordplay.
I cannot really understand how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is found within the answer.
'you' could be 'u' (commonly used in online communication) and 'u' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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

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