What does the cryptic crossword clue "‘100 + 1 + 100 + 0? Not unknown’ – Roman senator (6)" mean?

The wordplay uses a charade (building blocks). C (synonym="100") + I (synonym="1") + C (synonym="100") + ERO (synonym="0, not Z (“unknown” in mathematics") = CICERO The answer is CICERO.

‘100 + 1 + 100 + 0? Not unknown’ – Roman senator (6)

Guardian Cryptic #29448 | 25 Across | 2024-07-30 flower

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