Early radio receiver (7,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">early radio receiver</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crystal set that I've seen before include "Radio" , "Receiver" , "Matching glasses" , "used to receive long ago" , "matching items of glassware?" .)
(Other definitions for headset that I've seen before include "Audio communication equipment worn by pilots, DJs etc" , "Communication kit" , "Radio operator's equipt." , "Combined earphones with microphone" , "One covers the ears" .)