Solar ray (7)
I believe the answer is:
sunbeam
'solar ray' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sunbeam that I've seen before include "Bright ray -- bus name (anag)" , "sheds a bit of light" , "Ray of natural light" , "Ray of solar light" , "Bright shaft of daylight" .)