Magician's hiding place
I believe the answer is:
sleeve
'magician's hiding place' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sleeve that I've seen before include "Some wear their hearts on it" , "It covers the arm" , "Record-holder" , "Cover for arm and vinyl record" , "Cover for a gramophone record" .)