What does the cryptic crossword clue "Check out underground laboratory item (4,4)" mean?

The definition is "laboratory item". The wordplay uses a charade (building blocks). TEST (synonym="Check") + TUBE (synonym="underground") = TESTTUBE; definition: "laboratory item" The answer is TESTTUBE.

Check out underground laboratory item (4,4)

Daily Mail Cryptic #16808 | 20 Across | 2022-04-05 flower

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