What does the cryptic crossword clue "Bismuth has to turn red, perhaps piebald (8)" mean?

The definition is "perhaps piebald". The wordplay uses a charade (building blocks). BI (synonym="Bismuth") + COLOUR (synonym="red,") = BICOLOUR; definition: "perhaps piebald" The answer is BICOLOUR.

Bismuth has to turn red, perhaps piebald (8)

Guardian Cryptic #27674 | 23 Across | 2018-11-23 flower

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