What does the cryptic crossword clue "Number working, twelve (4)" mean?

The definition is "twelve". The wordplay uses a charade (building blocks). NO (synonym of "Number") + ON (synonym of "working,"); definition: "twelve" The answer is Noon.

Number working, twelve (4)

Telegraph Prize Cryptic #3145 | 26 Down | 2022-01-30 flower

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