Foreign Office spies nicking a cricket club's bread (8)
I believe the answer is:
'bread' is the definition.
(I've seen this before)
'foreign office spies nicking a cricket club's' is the wordplay.
'foreign office' becomes 'FO' (abbreviation).
'spies' becomes 'CIA' (Central Intelligence Agency).
'nicking' indicates putting letters inside (I've seen this in other clues).
'cricket club' becomes 'cc' (cricketing abbreviation).
'cia' going around 'acc' is 'caccia'.
(Other definitions for focaccia that I've seen before include "Flat Italian bread" , "cheer in Rome?" , "Italian bread with olive oil and herbs" , "Italian herb bread" , "Type of Italian bread" .)