What does the cryptic crossword clue "Much of the universe not seen to be important after nightfall (4,6)" mean?

The definition is "Much of the universe not seen". The wordplay uses a charade (building blocks). DARK (synonym="DARK") + MATTER (synonym="MATTER") = DARK MATTER The answer is DARK MATTER.

Much of the universe not seen to be important after nightfall (4,6)

Times Cryptic #28975 | 4 Down | 2024-07-22 flower

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