Crossword Genius

Swear as dance party beginning to end? (4)

Ross

I believe the answer is:

aver

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'swear' is the definition.
(synonyms)

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(Other definitions for aver that I've seen before include "State; say" , "State firmly, propound" , "Formally assert" , "Declare or insist" , "State decisively" .)

I've seen this clue in The Telegraph.
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