What does the cryptic crossword clue "Commercial break without purpose (6)" mean?

The definition is "without purpose". The wordplay uses a charade (building blocks). AD (synonym of "Commercial") + RIFT (synonym of "break"); definition: "without purpose" The answer is ADRIFT.

Commercial break without purpose (6)

Telegraph #30224 | 22 Across | 2023-02-15 flower

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Independent Cryptic #10932 (2021-10-26)