What does the cryptic crossword clue "Person who paints diameter and two lines in circle (5)" mean?

The definition is "circle". The wordplay uses a charade (building blocks). RA (synonym="artist – person who paints") + D (synonym="diameter") + II (synonym="two") = RADII; definition: "lines in circle" The answer is RADII.

Person who paints diameter and two lines in circle (5)

Guardian Cryptic #28217 | 17 Across | 2020-08-20 flower

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