Military dining room (4)

I believe the answer is:

mess

'military dining room' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for mess that I've seen before include "State of disorder" , "Place to eat" , "Chaos, confusion" , "Jumble" , "Untidy confusion" .)

I've seen this clue in the Irish Times (Simplex) and The Guardian.

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