Tape cartridge (8)
I believe the answer is:
cassette
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tape cartridge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cassette that I've seen before include "Tape unit" , "Test case (anag.)" , "recording device" , "Vintage recording" , "Test case about tape container" .)