Processed meat from old sheep given to setter (8)
I believe the answer is:
pastrami
'processed meat' is the definition.
'old sheep given to setter' is the wordplay.
'old' becomes 'past' ('past' can be similar in meaning to 'old').
'sheep' becomes 'ram' (ram is a kind of sheep).
'given to' means one lot of letters go next to another.
'setter' becomes 'i' (the person that set the crossword).
'past'+'ram'+'i'='PASTRAMI'
'from' acts as a link.
(Other definitions for pastrami that I've seen before include "Highly seasoned cut of smoked beef" , "Spiced sliced beef" , "Seasoned dish" , "Spicy smoked beef" , "Thinly sliced beef" .)