Supporter, Promoter, Backer
This page is the CodyCross answer for the clue below from Australia, Group 1006, Puzzle 1 (Eddie Koiki Mabo Library).
Question is: Supporter, Promoter, Backer
and the answer is: ADVOCATE
Word Meaning:
ADVOCATE — Someone whose job is to speak for someone's case in a court of law; a counsel.
Definitions from Wiktionary.