What does the cryptic crossword clue "Not on time when trade is slack (3,6)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Not on time when trade is slack (3,6)

Guardian Cryptic #25785 | 7 Down | 2012-11-05 flower

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