Double curve (3)

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 Newsday, the Penny Press, The Star Tribune, the Universal, The Wall Street Journal, the LA Times, The New York Times and the Sydney Morning Herald.

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