Crossword Genius

Part of Joan’s circle? (3)

Ross

I believe the answer is:

arc

'circle?' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for arc that I've seen before include "Section of circumference" , "Luminous electrical discharge" , "Segment of circumference" , "A curve for Joan of . . ." , "Light" .)

I've seen this clue in The Times.
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