The brightest star in the night sky (3,4)

I think it could be either:

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3,4

dog star

(Other definitions for dog star that I've seen before include "'Another name for the Sirius constellation (3,4)'" , "What may not be seen on cloudy night" , "Sirius in the sky" , "slightly flashy night-spot?" , "Drags to find other name for Sirius" .)

I've seen this clue in The Guardian.

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