Musical piece coming from speaker on bottom of hi-fi? Ordinary (8)
I believe the answer is:
oratorio
'musical piece' is the definition.
'speaker on bottom of hi-fi? ordinary' is the subsidiary indication.
'speaker' becomes 'orator' (orator is a kind of speaker**).
'on' means one lot of letters go next to another.
'bottom of' says to take the final letters.
'ordinary' becomes 'o' (abbreviation e.g. O-Levels).
The last letter of 'hifi' is 'i'.
'orator'+'i'+'o'='oratorio'
'coming from' is the link.
(Other definitions for oratorio that I've seen before include "Large choral work" , "Religious musical work" , "E.g. Messiah or Elijah" , "Comprehensive music" , "Sacred musical piece" .)