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Longman Dictionary of Contemporary English
clarion call
noun
EXAMPLES FROM OTHER ENTRIES
▪ Taken together, the studies are a clarion call to doctors to make drug therapy safer.
EXAMPLES FROM CORPUS
▪ Ability apart, if such determination should only result in defeat, then what price the victor's clarion call?
▪ But just supposing yesterday's clarion call is the answer to the serious concerns which exist about reading standards in schools.
Wiktionary
clarion call

alt. (context figuratively English) Appeal, urgent call to action. n. (context figuratively English) Appeal, urgent call to action.

Usage examples of "clarion call".

Then-far away-Sturm heard the clear, clarion call of a trumpet, its music cold as the air from the snow-covered mouetains of his homeland in the distance.

Then-Ear away-Sturm heard the clear, clarion call of a j trumpet, its music cold as the air from the snow-covered mouetains of his homeland in the distance.

Their whispered exchange, with its all too human quality, and the further revelation of a power beyond even them, returned to her suddenly and hung in her mind like a clarion call.

You may be confused and frightened by it all, but in some secret part of your mind and your soul you understand that it is the first clarion call of the ancient devils, come again to rule us.