Crossword Genius

The never-ending round (6)

Ross

I believe the answer is:

circle

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'round' is the definition.
(I know that round can be written as circle)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for circle that I've seen before include "Theatre tier; go round" , "Number of people bound together by similar interests - sound round" , "Symmetrical closed curve" , "Round shape" , "Curved figure" .)

I've seen this clue in The Telegraph.
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