Abolitionist Sojourner (5)
I believe the answer is:
truth
'abolitionist sojourner' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for truth that I've seen before include "known facts" , "Candour" , "Veracity, faithfulness" , "Veracity; established fact" , "Belief accepted as correct" .)