A broad smile from Ray (4)
I believe the answer is:
beam
I believe this clue is a double definition.
'a broad smile' is the first definition.
(I've seen this before)
'ray' is the second definition.
(I know that ray can be written as beam)
'from' is the link.
(Other definitions for beam that I've seen before include "Shine" , "Ray of light or a large smile" , "Smile, transmit (radio signal)" , "Supporting structure" , "Piece of timber - shaft of light" .)