Soprano thrown out of bar in hail (3)
I believe the answer is:
ave
'hail' is the definition.
(greeting in Latin)
'soprano thrown out of bar' is the wordplay.
'soprano' becomes 's' (musical abbreviation).
'thrown out of' suggests deleting specific letters.
'bar' becomes 'save' (both can mean 'except').
'save' with 's' taken out is 'AVE'.
'in' acts as a link.
(Other definitions for ave that I've seen before include "Latin greeting" , "Hail in old Rome" , "Hail as to Maria" , "Hello to the old Romans" , "Hail (Latin)" .)