Sausage product unfortunately going up M1 (6)
I believe the answer is:
salami
'sausage product' is the definition.
'unfortunately going up m1' is the wordplay.
'unfortunately' becomes 'alas' (I've seen this before).
'going up' shows that the letters should be reversed in order.
'm1' becomes 'mi' (resembles M1).
'alas' in reverse letter order is 'sala'.
'sala'+'mi'='SALAMI'
(Other definitions for salami that I've seen before include "Italian sausage (a kind of tactics?)" , "Highly seasoned Italian sausage" , "meat product" , "Sausage served sliced" , "Hooked" .)