State in which one has no voice? In a manner of speaking, it's an impediment to free speech! (10)

I believe the answer is:

laryngitis

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(Other definitions for laryngitis that I've seen before include "Sore throat" , "Inflammation of the windpipe" , "Throat infection" , "Inflammation of part of throat" , "Inflammation of the vocal cords" .)

I've seen this clue in The Irish Times.

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