What does the cryptic crossword clue "Eve's vicar is upset when the order's changed (4,5)" mean?

The wordplay uses an anagram. anagram of EVESVICAR ("Eve's vicar") [anagram: "upset"] = VICEVERSA The answer is VICEVERSA.

Eve's vicar is upset when the order's changed (4,5)

Guardian Cryptic #23264 | 25 Across | 2004-10-04 flower