What does the cryptic crossword clue "I appoint trio in a new order as appeasement (12)" mean?

The wordplay uses an anagram. anagram of I + APPOINT + TRIO = PROPITIATION The answer is PROPITIATION.

I appoint trio in a new order as appeasement (12)

Daily Mail Cryptic #17192 | 7 Down | 2023-09-25 flower