Finished with strike over one beef (8)
I believe the answer is:
pastrami
'beef' is the definition.
(pastrami is a kind of beef)
'finished with strike over one' is the wordplay.
'finished with' is a charade indicator (letters next to each other).
'strike' becomes 'ram' (I've seen this before).
'over' becomes 'past' (I've seen this before**).
'one' becomes 'i' (Roman numeral).
'ram' put after 'past' is 'pastram'.
'pastram'+'i'='PASTRAMI'
(Other definitions for pastrami that I've seen before include "beef dish" , "Thinly sliced beef" , "smoked joint" , "Smoked, highly-seasoned cut of beef" , "Sliced cured beef" .)