Selfless sort (8)
I believe the answer is:
altruist
'selfless sort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for altruist that I've seen before include "One who lives and acts in the interests of others" , "One concerned with others' interest" , "Philanthropist" , "Selfless helper of others" , "One acts selflessly" .)