What does the cryptic crossword clue "Judge rarebit after it’s been cooked (7)" mean?

The definition is "Judge". The wordplay uses an anagram. anagram of RAREBIT = ARBITER; definition: "Judge" The answer is ARBITER.

Judge rarebit after it’s been cooked (7)

Daily Mail Cryptic #16337 | 22 Down | 2020-06-15 flower