Double curve

I think it could be either:

Which length description are you looking for?:

ess

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

This is the entire clue.

(Other definitions for ess that I've seen before include "Letter from Mid-West" , "Curvaceous letter" , "Alphabet letter" , "Nineteenth letter" , "top secret" .)

I've seen this clue in The Wall Street Journal, the Newsday, the Sydney Morning Herald, The New York Times, the Universal, The Star Tribune, the LA Times and the Penny Press.

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.