Execute part of a card trick from China, with introduction from magician (4)
I believe the answer is:
palm
'execute part of a card trick' is the definition.
(palm can mean to hide in your palm)
'china with introduction from magician' is the wordplay.
'china' becomes 'pal' (china plate is Cockney rhyming slang for mate).
'with' means one lot of letters go next to another.
'introduction from magician' becomes 'm' (I can't explain this - if you can you should believe this answer much more).
'pal'+'m'='PALM'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for palm that I've seen before include "Tree with no branches and large leaves" , "Use hand" , "Tropical tree or part of hand" , "Inner surface of the hand" , "Tropical tree; conceal" .)