All together, in music (5)
I believe the answer is:
tutti
'all together in music' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tutti that I've seen before include "Orchestral passage" , "Every instrument to play" , "All (stage direction)" , "All performers (mus.)" , "With all instruments playing at once (music)" .)