Part of a circle (7)

I think it could be either:

Which length description are you looking for?:

arc

'part of a circle' is the definition.
('arc' is part of 'circle')

This is the entire clue.

(Other definitions for arc that I've seen before include "development of plot" , "section of Circle Line" , "bends?" , "Part of a circle's circumference" , "A curve for Joan of . . ." .)

I've seen this clue in the LA Times, the Penny Press and the Newsday.

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