One with unselfish motivations (8)

I believe the answer is:

altruist

(Other definitions for altruist that I've seen before include "One acts selflessly" , "Person who does good from unselfish motives" , "Person acting solely for the good of others" , "Person who acts from unselfish motives" , "Philanthropist" .)

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

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