Crossword Genius

They go round in circles (4)

Ross

I believe the answer is:

arcs

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This could be a double definition.

'they' is the first definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

'go round in circles' is the second definition.
The definition and answer can be both shapes as well as being plural nouns.
Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for arcs that I've seen before include "Segments of a circle" , "Parts of a circle" , "Curving trajectories" , "Portions of a circle" , "Bows" .)

I've seen this clue in The Globe and Mail.
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