German prisoner-of-war camp for officers established in World War I (5)

I believe the answer is:

oflag

(Other definitions for oflag that I've seen before include "Place for detention" , "German prisoner of war camp for officers" , "German PoW camp for officers" , "German prisoner-of-war camp for officers" , "Place of internment" .)

I've seen this clue in The Mirror.

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