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Store food in besieged town, king having fled (4,4)

Ross

I believe the answer is:

meat safe

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'store' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
I also know that 'store' relates to this answer.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for meat safe that I've seen before include "Ventilated food store" , "store cupboard" , "Ventilated cupboard for storing pork, beef etc" .)

I've seen this clue in The Guardian.
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