Via speech bubble protest (6)

I believe the answer is:

orally

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'via speech' is the definition.
(I've seen this in another clue)

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(Other definitions for orally that I've seen before include "as auditions are done" , "How anyone would speak" , "via the trap" , "How one speaks" , "By (word of) mouth" .)

I've seen this clue in the Sydney Morning Herald.

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