What does the cryptic crossword clue "Mo Ali sits around getting very high (9)" mean?

The definition is "very high". The wordplay uses an anagram. anagram of MO + ALI + SITS = ALTISSIMO; definition: "very high" The answer is ALTISSIMO.

Mo Ali sits around getting very high (9)

Independent Cryptic #11885 | 11 Down | 2024-11-12 flower