What does the cryptic crossword clue "Aperture set below light to stop effect from flash (3-3)" mean?

The definition is "effect from flash". The wordplay uses a charade (building blocks). RED (synonym="traffic ‘light to stop’") + EYE (synonym="‘aperture’") = REDEYE; definition: "effect from flash" The answer is REDEYE.

Aperture set below light to stop effect from flash (3-3)

Guardian Cryptic #29265 | 11 Down | 2023-12-29 flower

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