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

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