Crossword Genius

Blue steady light, not good (3)

Ross

I believe the answer is:

low

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'blue' is the definition.
(both can mean sad)

I don't understand the rest of the clue.

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(Other definitions for low that I've seen before include "Opposite of high" , "Humble; dejected" , "Depressed or base" , "Depressed; near the ground" , "Unimportant sort of owl" .)

I've seen this clue in The Independent.
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