Smile from Ray (4)
I believe the answer is:
beam
This clue is a double definition.
'smile' is the first definition.
(to beam is to smile)
'ray' is the second definition.
(synonyms)
'from' acts as a link.
(Other definitions for beam that I've seen before include "Rafter - smile - width" , "one gets from the Sun" , "Ray; structural timber" , "Gymnast's bar; broad smile" , "Shine" .)