What does the cryptic crossword clue "Complex number precedes zero (7)" mean?

The definition is "zero". The wordplay uses a charade (building blocks). NO (synonym="number") + THING (synonym="obsession, complex") = NOTHING; definition: "zero" The answer is NOTHING.

Complex number precedes zero (7)

Times Cryptic #28643 | 2 Down | 2023-06-30 flower

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