What does the cryptic crossword clue "Start of operation with nothing on time (4,4)" mean?

The definition is "time". The wordplay uses a charade (building blocks). ZERO (synonym="ZERO") + HOUR (synonym="HOUR") = ZEROHOUR The answer is ZEROHOUR.

Start of operation with nothing on time (4,4)

Guardian Cryptic #29196 | 7 Down | 2023-10-09 flower

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