Odo , British Ambassador to the German Empire from 1871-84 (7)

I believe the answer is:

russell

(Other definitions for russell that I've seen before include "Bertrand ___ , philosopher and mathematician, d. 1970" , "He controversially filmed" , "2 [PHILOSOPHER]" , "group of universities" , "Ken -, Eng. film director (Women in Love)" .)

I've seen this clue in The Mirror.

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