What does the cryptic crossword clue "Knocks over box (4)" mean?

The definition is "box". The wordplay uses charade, reversal. reverse of RAPS (synonym of "Knocks") [reversal: "over"]; definition: "box" The answer is SPAR.

Knocks over box (4)

Telegraph #30880 | 13 Across | 2025-03-21 flower

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Guardian Cryptic #29094 (2023-06-12)