What does the cryptic crossword clue "Dark Matter seemingly invisible to youth in test (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Dark Matter seemingly invisible to youth in test (7)

Guardian Cryptic #29840 | 27 Across | 2025-10-31 flower

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