What does the cryptic crossword clue "Headcase swaps sides – it's something of a cliché (8)" mean?

The definition is "it’s something of a cliché". The wordplay uses a charade (building blocks). CHEST (synonym=""case"") + NUT (synonym=""head"") = CHESTNUT The answer is CHESTNUT.

Headcase swaps sides – it's something of a cliché (8)

Guardian Cryptic #29275 | 4 Across | 2024-01-10 flower

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