A German prisoner-of-war camp in World War II (6)

I believe the answer is:

stalag

(Other definitions for stalag that I've seen before include "Water at the mouth" , "German prisoner-of-war camp of WW2" , "German prison camp in WW2" , "WWII German prisoner of war camp" , "German World War two prison camp" .)

I've seen this clue in The Independent.

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