What does the cryptic crossword clue "Commercial lines are damaging … (7)" mean?

The definition is "damaging …". The wordplay uses a charade (building blocks). AD (synonym of "Commercial") + VERSE (synonym of "lines"); definition: "damaging ..." The answer is ADVERSE.

Commercial lines are damaging … (7)

Guardian Cryptic #28958 | 1 Across | 2023-01-04 flower

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