Burst of applause during rehearsal vocals (5)
I believe the answer is:
salvo
'burst of applause' is the definition.
(I've seen this in another clue)
'during rehearsal vocals' is the wordplay.
'during' says the answer is hidden in the clue.
'SALVO' can be found hidden inside 'rehearsal vocals'.
(Other definitions for salvo that I've seen before include "Round of fire" , "Several rounds" , "Rapid simultaneous shooting" , "Simultaneous discharge of weapons" , "Burst of fire from several guns" .)