Crossword Genius

Refectory entrance destroyed without rubble, initially (7)

Ross

I believe the answer is:

canteen

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'refectory' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for canteen that I've seen before include "Workplace eatery" , "Employees' restaurant" , "Office eating area" , "Institutional eating place" , "A case of cutlery" .)

I've seen this clue in The Mirror.
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