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Pacesetter

noun

Noun

1
One who or that which determines the rate of action through leading.
"It’s all been a dreadful embarrassment, but why should anyone outside Germany be concerned? Because Documenta was always a pacesetter — and this year’s edition certainly put its finger on a larger shift, seen too in our museums, our art schools and our magazines, away from aesthetic ambition and intellectual seriousness and toward the easier comforts of togetherness, advocacy and fun."
2
a horse used to set the pace in racing wordnet
3
a leading instance in its field wordnet

From pace + setter.

Unscramble this word: pacesetter