Crossword Genius

They're cards! (6)

Ross

I believe the answer is:

jokers

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

'cards' is the definition.
(I know this)

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

Can you help me to learn more?

(Other definitions for jokers that I've seen before include "Comedians, comics" , "Cards - pranksters" .)

I've seen this clue in the Evening Standard.
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