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Infidelity snarled at rudely (8)

Ross

I believe the answer is:

adultery

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'infidelity' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for adultery that I've seen before include "cheating" , "Moral lapse" , "Extramarital bedroom antics" , "excluding union involvement?" , "frowned-on relations" .)

I've seen this clue in The Times and The Sunday Times.
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