What does the cryptic crossword clue "Attack arrangement that’s working (3,4)" mean?

The definition is "Attack". The wordplay uses a charade (building blocks). SETUP (synonym of "arrangement") + ON (synonym of "working"); definition: "Attack" The answer is SETUPON.

Attack arrangement that’s working (3,4)

Guardian Cryptic #29432 | 4 Down | 2024-07-11 flower

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Guardian Cryptic #29327 (2024-03-11)