What does the cryptic crossword clue "Playing nice new record, 'Firestarter' (10)" mean?

The wordplay uses an anagram. anagram of NICE (synonym="NICE") + DIARY (synonym="record") + N (synonym="new") = INCENDIARY The answer is INCENDIARY.

Playing nice new record, 'Firestarter' (10)

Guardian Cryptic #29271 | 1 Down | 2024-01-05 flower