Share of the supply (6)

I believe the answer is:

ration

(Other definitions for ration that I've seen before include "A fixed allowance in times of scarcity" , "A measured portion in times of scarcity" , "Helping" , "Limit to a fixed amount, be sparing" , "Limit supply of (eg, food)" .)

I've seen this clue in The New York Times.

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