A champion golfer and a real card! (4,2,5)

I believe the answer is:

king of clubs

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

'card' is the definition.

'a champion golfer and a real' is the wordplay.
I cannot really understand how this works, but
'champion' could be 'king' (I've seen this in other clues) and 'king' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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