"Not again!" (3)

I think it could be either:

Which length description are you looking for?:

ugh

'not again' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ugh that I've seen before include "Exclamation of disgust (3)" , "Exclamation of horror" , "Exclamation of disgust, at 22 ac say" , "It's nasty" , "How repulsive!" .)

I've seen this clue in The New York Times and the Universal.

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