Enter a clue or pattern or both:
The Clue
Unsuccessful '70s-'80s cause (3 letter answer)
The Answer
ERA
Tags
Notes
The answer ERA is very common and appears about once every 16 puzzles.
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A pitcher should keep it low
Definition
ERA as a noun:
1. (era, epoch) = a period marked by distinctive character or reckoned from a fixed point or event
2. (era, geological era) = a major division of geological time; an era is usually divided into two or more periods
3. (earned run average, ERA) = (baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched