Crossword Genius

He's a card! (5)

Ross

I believe the answer is:

joker

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

'card' is the definition.
(joker is a type of playing card)

'he's a' is the wordplay.
I cannot quite see how this works, but
'he' could be 'ker' and 'ker' is found in the answer.
The remaining letters 'jo' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for joker that I've seen before include "Humorist" , "Jester" , "Buffoon" , "Comedian" , "Pack's extra card" .)

I've seen this clue in the Evening Standard.
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