What does the cryptic crossword clue "Highly reliable scan (10)" mean?

The definition is "scan". The wordplay uses a charade (building blocks). ULTRA (synonym="ULTRA") + SOUND (synonym="reliable, as in a sound foundation for a building") = ULTRASOUND; definition: "scan" The answer is ULTRASOUND.

Highly reliable scan (10)

Independent Cryptic #11862 | 3 Down | 2024-10-16 flower

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