Crossword Genius

What a casino employee might say is perfect? (5)

Ross

I believe the answer is:

ideal

'is perfect?' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

(Other definitions for ideal that I've seen before include "Perfect; a standard of perfection" , "immaculate" , "Pattern" , "Most suitable" , "Just perfect, couldn't be better" .)

I've seen this clue in The Times.
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