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

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