What does the cryptic crossword clue "Dome, say, renovated at a point in the future? (7)" mean?

The wordplay uses an anagram. anagram of DOME, + SAY, = SOMEDAY The answer is SOMEDAY.

Dome, say, renovated at a point in the future? (7)

Daily Mail Cryptic #17275 | 18 Down | 2024-01-19 flower