Rating symbols (5)
I believe the answer is:
stars
'rating symbols' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stars that I've seen before include "Leading actors" , "Celestial bodies of hot gases" , "''What is the ...? What is the ...? '' (Juno and the Paycock)" , "plays a leading role" , "Heavenly bodies" .)