What does the cryptic crossword clue "Don's dad's not altered rules for action? (3,3,5)" mean?

The wordplay uses an anagram. anagram of DON'S + DAD'S + NOT = DOSANDDONTS The answer is DOSANDDONTS.

Don's dad's not altered rules for action? (3,3,5)

Daily Mail Cryptic #17210 | 29 Across | 2023-10-19 flower