Crescent (3)

I think it could be either:

Which length description are you looking for?:

arc

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

This is all the clue.

(Other definitions for arc that I've seen before include "part of turning circle?" , "A curve for Joan of . . ." , "Light" , "Curved section" , "Luminous electrical discharge" .)

I've seen this clue in the Penny Press.

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