Crossword Genius

Loud speaker, improvisation of tenor underway? (7)

Ross

I believe the answer is:

stentor

'loud speaker' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for stentor that I've seen before include "Loud-voiced Greek at Troy" , "Mythical Greek warrior with an unusually loud voice" , "man with loudest voice" , "powerful speaker" .)

I've seen this clue in The Guardian.
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