Crossword Genius

What a conjuror does with cards and trees? (5)

Ross

I believe the answer is:

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

'trees?' is the definition.
(palm is a kind of tree)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for palms that I've seen before include "Hand parts or tropical trees", "Large, tropical trees".)