What does the cryptic crossword clue "Old artiste doing a turn in the grave? (4,2,4)" mean?

The wordplay uses an anagram. anagram of OLDARTISTE ("Old artiste") [anagram: "doing"] = LAIDTOREST The answer is LAIDTOREST.

Old artiste doing a turn in the grave? (4,2,4)

Guardian Cryptic #22076 | 11 Across | 2000-12-08 flower