Crossword Genius

Experts: card sharks, primarily (4)

Ross

I believe the answer is:

aces

'experts' is the definition.
(ace is a kind of expert)

'card sharks primarily' is the wordplay.
'card' becomes 'ace' (ace is a kind of card).
'primarily' suggests taking the first letters.
The initial letter of 'sharks' is 's'.
'ace'+'s'='ACES'

(Other definitions for aces that I've seen before include "winning shots" , "Case of top cards" , "never come back" , "Tennis serves the receiver can't reach" , "wartime pilots?" .)

I've seen this clue in The Telegraph.
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