LP holder (6)
I believe the answer is:
sleeve
'lp holder' 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 "It covers the arm" , "Part of clothing covering arm" , "Some wear their hearts on it" , "Some wear their heart on it" , "Part of a shirt - old record holder" .)