Can’t a research showcase a star? (7)
I believe the answer is:
antares
'a star?' is the definition.
(star in the constellation of Scorpius)
'can't a research showcase' is the wordplay.
'ANTARES' is hidden within the letters.
However, I'm unsure how this is indicated.
(Other definitions for antares that I've seen before include "brilliant point" , "Red supergiant star in Scorpio; nae star (anag.)" , "RS [RED STAR]" , "Red supergiant star in Scorpius" , "Star reddened" .)