Crossword Genius

Sound beginning (5)

Ross

I believe the answer is:

ultra

'sound beginning' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ultra that I've seen before include "Prefix meaning extreme or excessive" , "Prefix meaning beyond or excessively" , "Political extremist" , "Extreme (as in UV)" , "such sound treatment?" .)

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