Italian staple Romeo's consumed, starters of marinated Ischian beef (8)
I believe the answer is:
pastrami
'beef' is the definition.
(I know that pastrami is a type of beef)
'italian staple romeo's consumed starters of marinated ischian' is the wordplay.
'italian staple' becomes 'pasta' (I've seen this before).
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'consumed' indicates putting letters inside.
'starters of' suggests taking the first letters.
The initial letters of 'marinated ischian' is 'mi'.
'pasta' going around 'r' is 'pastra'.
'pastra'+'mi'='PASTRAMI'
(Other definitions for pastrami that I've seen before include "smoked joint" , "Spicy smoked beef" , "Highly seasoned cut of smoked beef" , "A tramp is (anag) - meat" , "Tapered tuck; missile" .)