Rays (5)
I believe the answer is:
beams
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rays</span>' is the definition.<br/ ><span class="explanation-format__explanation">('beam' can be a synonym of 'ray')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for beams that I've seen before include "Smiles broadly or sunnily" , "Smiles; joists" , "Shines" , "Rays of light" .)