Ceiling support (4)
I believe the answer is:
beam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ceiling support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for beam that I've seen before include "Smile radiantly" , "A broad smile like lunar ray" , "one gets from the Sun" , "Big smile; ray" , "Smile, transmit (radio signal)" .)