What does the cryptic crossword clue "Party not settled? Seatbelt fastened incorrectly (9)" mean?

The definition is "Party". The wordplay uses an anagram. anagram of SEATBEFAN = BEANFEAST; definition: "Party" The answer is BEANFEAST.

Party not settled? Seatbelt fastened incorrectly (9)

Guardian Cryptic #29597 | 19 Across | 2025-01-21 flower