Twinkler in the night sky (4)
I believe the answer is:
star
'twinkler in the night sky' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for star that I've seen before include "Outstanding entertainer" , "top player" , "Celestial body of hot gases" , "Famous performer" , "Polaris, possibly" .)