Crossword Genius

Shrill war trumpet (7)

Ross

I believe the answer is:

clarion

(Other definitions for clarion that I've seen before include "Trumpet (now more likely a newspaper)" , "Loud, clear and rousing" , "Old trumpet, organ stop" , "Loud and clear; shrill war trumpet" , "Loud, clear (call); old trumpet" .)

I've seen this clue in The Telegraph and The Times.
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