Spoken during revolutionary hymn (7)
I believe the answer is:
chorale
'hymn' is the definition.
(I know that chorale is a type of hymn)
'spoken during revolutionary' is the wordplay.
'spoken' becomes 'oral' (similar in meaning).
'during' indicates putting letters inside.
'revolutionary' becomes 'Che' (Che Guevara).
'oral' inserted into 'che' is 'CHORALE'.
(Other definitions for chorale that I've seen before include "Lutheran hymn-tune" , "Composition" , "Psalm or hymn tune" , "vocal music" , "Harmonised hymn tune" .)