Crossword Genius

They're dab hands at cards (4)

Ross

I believe the answer is:

aces

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

'cards' is the definition.
(ace is a kind of card)

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

Can you help me to learn more?

(Other definitions for aces that I've seen before include "Tennis serves the receiver can't reach" , "winning shots" , "Case of top cards" , "passes with flying colours in US" , "They're high and low on cards" .)

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