Slow, to Salieri (5)
I believe the answer is:
lento
'slow to salieri' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lento that I've seen before include "Slow musically" , "It's slower than adagio" , "Slowly (mus.)" , "How one scores slowly" , "Slow (music)" .)