The never-ending round (6)
I believe the answer is:
circle
'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" .)