Crossword Genius

Smile brings some light (4)

Ross

I believe the answer is:

This clue is a double definition.

'smile' is the first definition.
(beaming is a kind of smiling)

'some light' is the second definition.
(beam is a kind of light)

'brings' is the link.

(Other definitions for beam that I've seen before include "Column of light", "XWD SETTER", "Rafter - smile - width", "Ray of light or a large smile", "Smile radiantly".)

I've seen this clue in The Independent.