What does the cryptic crossword clue "Two constants combined with speed of light – impressive (4)" 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.

Two constants combined with speed of light – impressive (4)

Guardian Cryptic #29872 | 1 Down | 2025-12-08 flower

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