From Longman Dictionary of Contemporary Englishtrendsettertrend‧set‧ter /ˈtrendˌsetə $ -ər/ noun [countable] FASHIONABLEsomeone who starts a new fashion or makes it popular —trendsetting adjective [only before noun]
Examples from the Corpus
trendsetter• But remember, she's a trendsetter.• And trendsetters will almost certainly be talking about this week's U2 concert and the latest single from local band, Therapy.• These trendsetters have a critical social role to play. 