Overwhelmingly won over ballroom by being vocal (6)

I believe the answer is:

verbal

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'being vocal' is the definition.
(thesaurus)

'overwhelmingly won over ballroom' is the wordplay.
'VERBAL' is hidden in amongst the letters.
However, I am unsure how this is indicated.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for verbal that I've seen before include "not written down" , "Spoken (abuse)" , "Word of mouth" , "argument" , "in speech" .)

I've seen this clue in The Irish Times.

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