Arched (6)
I believe the answer is:
curved
'arched' is the definition.
('curve' can be a synonym of 'arch')
This is all the clue.
(Other definitions for curved that I've seen before include "Gently bending" , "With rounded bends" , "Formed into an arc" , "Smoothly arched, like part of a circle" , "Bent" .)