Reserve supply (5)

I believe the answer is:

store

'reserve supply' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for store that I've seen before include "Eg, granite" , "Put by; shop" , "Save" , "Stock or supply, or warehouse for them" , "Supermarket" .)

I've seen this clue in the Universal, The Mirror, the Irish Times (Simplex), The Times, the Evening Standard and The Guardian.

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