What does the cryptic crossword clue "Enter old ground once smelling good (8)" mean?

The definition is "good". The wordplay uses an anagram. anagram of ENTER + OLD = REDOLENT; definition: "good" The answer is REDOLENT.

Enter old ground once smelling good (8)

Daily Mail Cryptic #16409 | 8 Down | 2020-09-23 flower