What does the cryptic crossword clue "Meet nun getting mixed up with riot (3,4)" mean?

The definition is "Meet". The wordplay uses an anagram. anagram of NUN + RIOT = RUNINTO; definition: "Meet" The answer is RUNINTO.

Meet nun getting mixed up with riot (3,4)

Daily Mail Cryptic #16842 | 28 Across | 2022-05-23 flower