Music tape (8)
I believe the answer is:
cassette
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">music tape</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cassette that I've seen before include "It may contain film" , "Source of music" , "Tape format" , "Spool of tape" , "Container that holds a magnetic tape" .)