Saint begins emitting raw energy on record player (6)
I believe the answer is:
stereo
'record player' is the definition.
(I've seen this in another clue)
'saint begins emitting raw energy on' is the wordplay.
'saint' becomes 'st' (abbreviation).
'begins' says to take the initial letters.
The initial letters of 'emitting raw energy on' is 'ereo'.
'st'+'ereo'='STEREO'
(Other definitions for stereo that I've seen before include "Sound coming from different directions" , "Record player" , "System of sound reproduction" , "Sound - not mono" , "Sound transmission from two sources through two channels" .)