Sort of music speaker icon, oddly (8)
I believe the answer is:
oratorio
'sort of music' is the definition.
'speaker icon oddly' is the wordplay.
'speaker' becomes 'orator' (orator is a kind of speaker).
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternate letters of 'icon' are 'io'.
'orator'+'io'='ORATORIO'
(Other definitions for oratorio that I've seen before include "E.g. Messiah or Elijah" , "Comprehensive music" , "Handel's Messiah, for example" , "Religious musical work" , "Musical composition usually with biblical theme (8)" .)