Audio equipment (4,9)
'audio equipment' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hi-fi that I've seen before include "Sound reproduction unit" , "Good sound reproduction, in short" , "Good quality sound system, in short" , "Reproduction of sound with little or no distortion, in short" , "Audio equipment" .)
'audio equipment' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for headset that I've seen before include "communication aid" , "Cans" , "Bicycle front bearing assembly" , "Combined earphones with microphone" , "Communications equipment on one's bonce" .)
'audio equipment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stereo that I've seen before include "Sound transmission from two sources through two channels" , "Sound transmission through two or more speakers" , "Record player" , "Sound transmitted through two speakers" , "Of sound equipment, having two speakers" .)