Crossword Genius

Eminem rocks, releasing trendy viral sensation (4)

Ross

I believe the answer is:

meme

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'viral sensation' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for meme that I've seen before include "online phenomenon" , "Often trite image" , "Image etc. that spreads rapidly on the Internet" , "Question that spreads on the internet" , "Concept that spreads rapidly on the Internet" .)

I've seen this clue in The Hindu.
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