Funny guy? He's quite a card! (5)

I believe the answer is:

joker

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

'funny guy?' is the definition.
(I've seen this in another clue)

'he's quite a card' is the wordplay.
'he' becomes 'Jo'.
'quite a card' becomes 'ker' (I am not sure about this - if you are sure you should believe this answer much more).
'jo'+'ker'='JOKER'

Can you help me to learn more?

(Other definitions for joker that I've seen before include "may appear wild in play" , "Humorist" , "Jester" , "53rd card in the pack?" , "Wild card" .)

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

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