What does the cryptic crossword clue "Degradation of middle, now vulgar (3-6)" mean?

The definition is "vulgar". The wordplay uses an anagram. anagram of MIDDLE, + NOW = LOW-MINDED; definition: "vulgar" The answer is LOW-MINDED.

Degradation of middle, now vulgar (3-6)

Times Cryptic #28797 | 1 Across | 2023-12-27 flower