Box of cutlery in a mess? (7)

I believe the answer is:

canteen

I believe this clue is a double definition.

'box of cutlery' is the first definition.
(canteen can mean an ornate box for holding cutlery)

'a mess?' is the second definition.
(both can mean a room for eating)

'in' is the link.

(Other definitions for canteen that I've seen before include "Workplace restaurant" , "Office or factory restaurant" , "Workers' cafe and cutlery box" , "NAAFI" , "Cafe, flask and cutlery box" .)

I've seen this clue in The Telegraph.

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