It's endless and could be magic (6)

I believe the answer is:

circle

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'magic' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for circle that I've seen before include "Move around (something)" , "Geometric shape" , "Ring - round" , "Orbit" , "Draw line around (something)" .)

I've seen this clue in the Evening Standard.

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