What does the cryptic crossword clue "Odd when man changes into this? (4-2-4)" mean?

The wordplay uses an anagram. anagram of ODDWHENMAN ("Odd when man") [anagram: "changes"] = HANDMEDOWN The answer is HANDMEDOWN.

Odd when man changes into this? (4-2-4)

Guardian Cryptic #29214 | 3 Down | 2023-10-30 flower