Crossword Genius

Jack is a fishy type - over here he's sharp whereas in the US he's seen as cheating with the pack (9)

Ross

I believe the answer is:

cardshark

I'm a little stuck... Click here to teach me more about this clue!

'jack is a fishy type over here he's sharp whereas in the us he's seen as cheating' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'the pack' is the wordplay.
I cannot really understand how this works, but
'pack' could be 'cards' (I've seen this before) and 'cards' is found within the answer.
The remaining letters 'hark' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'with' is the link.

Can you help me to learn more?

I've seen this clue in the Irish Times.
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