Crossword Genius

All leaders in opposition really antagonistic, Labour said (4)

Ross

I believe the answer is:

oral

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'said' is the definition.
(both can mean spoken)

I can't explain the remainder of the clue.

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(Other definitions for oral that I've seen before include "Spoken exam" , "Exam using speech" , "Relating to speech" , "By word of mouth, say exam" , "Of the voice" .)

I've seen this clue in The Telegraph.
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