What does the cryptic crossword clue "Sign of tooth decay displacing top of crown (5)" mean?

The definition is "Sign". The wordplay uses a deletion. ARIES (deletion) = ARIES; definition: "Sign" The answer is ARIES.

Sign of tooth decay displacing top of crown (5)

Times Cryptic #28669 | 14 Across | 2023-07-31 flower