The convenience of the military (7)

I believe the answer is:

latrine

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'the convenience' is the definition.
(latrine is a kind of convenience)

I can't explain the remainder of the clue.

(Other definitions for latrine that I've seen before include "Lavatory (in barracks)" , "Army lavatory" , "office" , "Camp lavatory" , "where to go in the army" .)

I've seen this clue in The Mirror.

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