Ultra (7)

I think it could be either:

Which length description are you looking for?:

extreme

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

This is all the clue.

(Other definitions for extreme that I've seen before include "Ultimate" , "Going to great lengths" , "end" , "Anything but moderate" , "Very great; exceptional" .)

I've seen this clue in The Mirror and The Daily Mail.

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