Star of Lyra (4)
I believe the answer is:
vega
'star of lyra' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vega that I've seen before include "Fifth brightest star" , "Bright star of constellation Lyra" , "Star in Lyra; grassy plain (Spanish)" , "Brightest star of constellation Lyra" , "Gave turn to a star" .)