Crossword Genius

Ethical to omit introduction in speech (4)

Ross

I believe the answer is:

oral

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'in speech' is the definition.
(oral means relating to speech)

I don't understand how the remainder of the clue works.

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(Other definitions for oral that I've seen before include "Of the voice" , "Unwritten examination" , "See 18" , "Type of exam" , "Spoken test" .)

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