What does the cryptic crossword clue "Sinners actively serve idol (9)" mean?

The definition is "Sinners". The wordplay uses an anagram. anagram of SERVE + IDOL = EVILDOERS; definition: "Sinners" The answer is EVILDOERS.

Sinners actively serve idol (9)

Times Cryptic #29000 | 16 Down | 2024-08-20 flower