Curvy letter (3)

I believe the answer is:

ess

'curvy letter' 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 "top secret" , "One next to tee" , "Curvaceous letter" , "Alphabet letter" , "Nineteenth letter" .)

I've seen this clue in the Penny Press, the King Feature Syndicate, the LA Times, The Star Tribune and The Wall Street Journal.

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