Stolen goods Oscar found in French department (4)
I believe the answer is:
loot
'stolen goods' is the definition.
(I've seen this before)
'oscar found in french department' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'found in' indicates putting letters inside.
'french department' becomes 'lot' (department in southern France).
'o' put inside 'lot' is 'LOOT'.
(Other definitions for loot that I've seen before include "rifle" , "Steal (goods); money" , "Steal goods as spoils" , "Swag, booty" , "Plunder - booty" .)