What does the cryptic crossword clue "Delay at home after change in date (6)" mean?

The definition is "Delay". The wordplay uses an anagram. anagram of IN + DATE = DETAIN; definition: "Delay" The answer is DETAIN.

Delay at home after change in date (6)

Daily Mail Cryptic #16554 | 5 Across | 2021-04-14 flower