Arthur __, prime minister 1902-1905 (7)

I believe the answer is:

balfour

(Other definitions for balfour that I've seen before include "Former PM" , "Tory PM" , "5,27 [PRIME MINISTER]" , "leader once" , "Prime minister nineteen hundred and two to nineteen hundred and five" .)

I've seen this clue in The Guardian.

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