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Onslaughts by Cupid perhaps could be fatal (5,7)

Ross

I believe the answer is:

heart attacks

I'm a little stuck... Click here to teach me more about this clue!

'could be fatal' is the definition.
I can't tell whether this definition defines the answer.

'onslaughts by cupid' is the wordplay.
'onslaughts' becomes 'attacks' ('attack' can be a synonym of 'onslaught').
'by' is a charade indicator (letters next to each other).
'cupid' becomes 'heart' (I can't justify this - if you can you should believe this answer much more).
'attacks' after 'heart' is 'HEART ATTACKS'.

'perhaps' acts as a link.

Can you help me to learn more?

(Another definition for heart attacks that I've seen is " Serious coronary episodes".)

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