Greens getting a conspicuous star (4)
I believe the answer is:
vega
'conspicuous star' is the definition.
(Vega is one of the brightest stars in the sky)
'greens getting a' is the wordplay.
'greens' becomes 'veg' (greens can informally mean vegetables).
'getting' says to put letters next to each other.
'veg'+'a'='VEGA'
(Other definitions for vega that I've seen before include "Bright star of constellation Lyra" , "Star in Lyra; grassy plain (Spanish)" , "Brightest star of constellation Lyra" , "Gave turn to a star" , "Fifth brightest star" .)