Crossword Genius

Oath I for one said out loud (6)

Ross

I believe the answer is:

avowal

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

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

Can you help me to learn more?

(Other definitions for avowal that I've seen before include "Open assertion" , "Statement" , "swear!" , "acknowledgement" , "Positive declaration" .)

I've seen this clue in The Sunday Times.
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