Is a con arranged where gamblers throng? (6)

I believe the answer is:

casino

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'gamblers throng?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'is a con arranged' is the wordplay.
'arranged' is an anagram indicator.
'is'+'a'+'con'='isacon'
'isacon' anagrammed gives 'CASINO'.

'where' acts as a link.

Can you help me to learn more?

(Other definitions for casino that I've seen before include "You can win a fortune here" , "Gaming-house" , "Gaming club" , "Gambling place" , "--- Royale (Fleming)" .)

I've seen this clue in The Sun.

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