Crossword Genius

Expert gardener is a card! (3,2,6)

Ross

I believe the answer is:

ace of spades

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

'card' is the definition.
(I know that ace of spades is a playing card)

'expert gardener is a' is the wordplay.
I cannot quite understand how this works, but
'expert' could be 'ace' (ace can informally mean very good) and 'ace' is located in the answer.
'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.
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