What does the cryptic crossword clue "Just a ban, or else reforms (10)" mean?

The definition is "Just". The wordplay uses an anagram. anagram of A + BAN, + OR + ELSE = REASONABLE; definition: "Just" The answer is Reasonable.

Just a ban, or else reforms (10)

Telegraph Prize Cryptic #3033 | 13 Down | 2019-12-08 flower