Teller's magic partner (4)
I believe the answer is:
penn
'teller's magic partner' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for penn that I've seen before include "William ---, Quaker colonist" , "US state (abbrev.)" , "Milk actor" , "Colonising Quaker" , "Early Quaker leader" .)