What does the cryptic crossword clue "Collapse of square block (5)" mean?

The definition is "Collapse". The wordplay uses a charade (building blocks). S (first_letter="square") + LUMP (synonym="block") = SLUMP; definition: "Collapse" The answer is SLUMP.

Collapse of square block (5)

Guardian Cryptic #28262 | 21 Across | 2020-10-12 flower

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