Record cover (6)
I believe the answer is:
sleeve
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">record cover</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sleeve that I've seen before include "It's attached to the armhole" , "Covering for arm or sleeve" , "Record-holder" , "Garment's arm" , "Container for LP" .)