Crossword Genius

Undisciplined characters winningly handy at poker? (4,5)

Ross

I believe the answer is:

wild cards

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

'winningly handy at poker?' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'undisciplined characters' is the wordplay.
'undisciplined' becomes 'wild' (I can't justify this - if you can you should believe this answer much more).
'characters' becomes 'cards' (card can mean an eccentric character).
'wild'+'cards'='WILD CARDS'

Can you help me to learn more?

(Another definition for wild cards that I've seen is " Maybe competitors in US open".)

I've seen this clue in the Evening Standard.
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