Crossword Genius

A rowdy group to tell the cards (7)

Ross

I believe the answer is:

ratpack

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'a rowdy group' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'tell the cards' is the wordplay.
'tell' becomes 'rat' (I've seen this in another clue).
'the cards' becomes 'pack'.
'rat'+'pack'='RATPACK'

'to' is the link.

Can you help me to learn more?

(Another definition for ratpack that I've seen is " Paparazzi as a group".)

I've seen this clue in the Sydney Morning Herald.
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