Crossword Genius

Sweaty exercise very popular years past making a comeback (3,4)

Ross

I believe the answer is:

hot yoga

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'sweaty exercise' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'popular years past making a comeback' is the wordplay.
'popular' becomes 'hot' (hot can mean popular or trendy).
'years' becomes 'y' (abbreviation).
'past' becomes 'ago' (similar in meaning).
'making a comeback' says the letters should be written backwards.
'ago' backwards is 'oga'.
'hot'+'y'+'oga'='HOT YOGA'

'very' acts as a link.

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I've seen this clue in The Guardian.
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