Arc (5)

I think it could be either:

Which length description are you looking for?:

curve

'arc' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for curve that I've seen before include "Comparable in some respects" , "Line on a graph" , "Non-straight line" , "Line that isn't straight" , "Shape of 23 down" .)

I've seen this clue in the Evening Standard, The Independent and the Universal.

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