What does the cryptic crossword clue "Old college principal rejecting a painter's many-sided figures (9)" mean?

The definition is "many-sided figures". The wordplay uses a charade (building blocks). POLY (synonym="POLY") + HED (synonym="HED") + RA (synonym="RA") = POLYHEDRA; definition: "many-sided figures" The answer is POLYHEDRA.

Old college principal rejecting a painter's many-sided figures (9)

Times Cryptic #28743 | 13 Down | 2023-10-25 flower

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