Crossword Genius

For the cards, they’re real experts (4)

Ross

I believe the answer is:

aces

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

This might be a double definition.

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

'real experts' is the second definition.
'aces' can be an answer for 'experts' (ace is a kind of expert). I am not certain of the 'real' bit.

'they're' acts as a link.

Can you help me to learn more?

(Other definitions for aces that I've seen before include "They're high and low on cards" , "Top (or bottom) cards" , "Playing cards with single pips on their faces" , "Unreturnable services" , "excellent service" .)

I've seen this clue in the Evening Standard.
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