Brightest star in the constellation Scorpius (7)

I believe the answer is:

antares

(Other definitions for antares that I've seen before include "Red supergiant star in Scorpius" , "Red supergiant star in Scorpio; nae star (anag.)" , "brilliant point" , "RS [RED STAR]" , "Star reddened" .)

I've seen this clue in The Mirror.

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