Assign stars to (4)
I believe the answer is:
rate
'assign stars to' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rate that I've seen before include "Assign a value to, appraise" , "Reckon; scold" , "Give a value to something" , "Regard" , "Think highly of; criticise severely" .)