Crossword Genius

National hazard of anonymous cards (10)

Ross

I believe the answer is:

valentines

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

'cards' is the definition.
(I know that Valentine is a type of cards)

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

Can you help me to learn more?

I've seen this clue in The Guardian.
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