Cover for arm and record (6)
I believe the answer is:
sleeve
'cover for arm and record' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sleeve that I've seen before include "Covering for arm or sleeve" , "Garment's arm" , "Some wear their heart on it" , "Cover for a gramophone record" , "It covers the arm" .)