Alpha's opposite (5)

I think it could be either:

omega

gowns

'alpha's opposite' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for omega that I've seen before include "Last thing" , "Ending of a series or sequence" , "symbol of resistance?" , "Athenian character" , "24th Greek letter" .)

I've seen this clue in The Telegraph, the USA Today, The Sun, the King Feature Syndicate, The New York Times and the Universal.

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