What does the cryptic crossword clue "Boost sound or light (4)" mean?

The definition is "light". The wordplay uses a homophone (sounds like). RAYS (sounds like "Boost") [homophone: "sound"]; definition: "light" The answer is RAYS.

Boost sound or light (4)

Guardian Cryptic #24181 | 10 Across | 2007-09-13 flower

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