What does the cryptic crossword clue "Leading double-O M frets about (8)" mean?

The definition is "Leading". The wordplay uses an anagram. anagram of O O + M FRETS = FOREMOST; definition: "Leading" The answer is FOREMOST.

Leading double-O M frets about (8)

Independent Cryptic #11615 | 19 Across | 2024-01-02 flower