Hyper

I think it could be either:

Which length description are you looking for?:

10*

ultra

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

This is all the clue.

(Other definitions for ultra that I've seen before include "Extreme (as in UV)" , "Far beyond the norm" , "Prefix meaning beyond or extremely" , "Immoderate" , "such sound treatment?" .)

I've seen this clue in the Newsday and the LA Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.