What does the cryptic crossword clue "Next heretical saint, Lucifer’s follower (8)" mean?

The wordplay uses an anagram. SAT (synonym="‘next’") + ANIST (synonym="ANIST") = SATANIST The answer is SATANIST.

Next heretical saint, Lucifer’s follower (8)

Guardian Cryptic #29565 | 14 Across | 2024-12-13 flower