In casino, cranky members upset dealer? (5)

I believe the answer is:

narco

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'dealer?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'in casino cranky members upset' is the wordplay.
'in' says the answer is hidden in the clue.
'upset' is a reversal indicator.
'ocran' is hidden in the letters of 'casino cranky members'.
'ocran' backwards is 'NARCO'.

Can you help me to learn more?

(Other definitions for narco that I've seen before include "Member of US drugs squad" , "Drugs agent (US slang)" , "Drug trafficker" , "American drug agent" .)

I've seen this clue in The Irish Times.

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