Foreign office accountant caught spies forging Italian product (8)
I believe the answer is:
focaccia
'italian product' is the definition.
(type of Italian bread)
'foreign office accountant caught spies' is the wordplay.
'foreign office' becomes 'fo'.
'accountant' becomes 'ca' (abbreviation for chartered accountant).
'caught' becomes 'c' (cricket abbreviation).
'spies' becomes 'cia'.
'fo'+'ca'+'c'+'cia'='FOCACCIA'
'forging' is the link.
(Other definitions for focaccia that I've seen before include "Type of Italian bread" , "Italian herb bread" , "Italian bread with olive oil and herbs" , "Flat Italian bread" , "cheer in Rome?" .)