[n] a regular customer [n] someone who supports or champions something [n] (French) the proprietor of an inn
frequenter, sponsor, supporter
abettor, admirer, advocate, aficionado, aid, aider, almoner, almsgiver, angel, apologist, assignor, assister, attender, audience, awarder, backer, befriender, benefactor, benefactress, benefiter, bestower, boatswain, booster, boss, buff, buyer, bwana, cap