Expression of grief about note on sausage (6)
I believe the answer is:
salami
'sausage' is the definition.
(salami is a kind of sausage)
'expression of grief about note on' is the wordplay.
'expression of grief' becomes 'alas' (I've seen this before).
'about' shows that the letters should be reversed in order.
'note' becomes 'mi' (as in 'do re mi'**).
'on' says to put letters next to each other.
'alas' in reverse letter order is 'sala'.
'sala'+'mi'='SALAMI'
(Other definitions for salami that I've seen before include "Highly-seasonal sausage" , "Spiced Italian sausage" , "Highly seasoned Italian sausage" , "Spicy preserved sausage" , "Sausage served sliced" .)