Oratorio, I judge, with sound rising around (6)
I believe the answer is:
elijah
'oratorio' is the definition.
(oratorio by Felix Mendelssohn)
'i judge with sound rising around' is the wordplay.
'judge' becomes 'j' (abbreviation for judge).
'with' means one lot of letters go next to another.
'sound' becomes 'hale' (both can mean healthy).
'rising' shows that the letters should be reversed in order (going up in a down clue).
'around' means one lot of letters goes inside another.
'hale' in reverse letter order is 'elah'.
'i'+'j'='ij'
'ij' put inside 'elah' is 'ELIJAH'.
(Other definitions for elijah that I've seen before include "he prophesied" , "Hebrew prophet in the time of Jezebel" , "Old Testament prophet" , "OT, Islamic prophet" , "Biblical prophet" .)