What does the cryptic crossword clue "Unstable minerals with oxygen return to standard state (9)" mean?

The definition is "return to standard state". The wordplay uses anagram, charade. anagram of MINERALS ("minerals") + O (abbreviation of "oxygen") [anagram: "Unstable"] = NORMALISE; definition: "return to standard state" The answer is NORMALISE.

Unstable minerals with oxygen return to standard state (9)

Independent Cryptic #1728 | 12 Across | 2023-04-09 flower

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