What does the cryptic crossword clue "Ex-PM: ‘Time to go, having gained ten stone’ (4)" mean?

The definition is "stone'". The wordplay uses a deletion. ONY (synonym="Blair ex-PM") + X (synonym="ten") = ONYX; definition: "stone'" The answer is ONYX.

Ex-PM: ‘Time to go, having gained ten stone’ (4)

Guardian Cryptic #29437 | 24 Down | 2024-07-17 flower

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