Broad beam (4)
I believe the answer is:
grin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">broad beam</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 grin that I've seen before include "Ring (anag.)" , "Smile while pulling back the lips" , "Facial expression showing amusement or pleasure" , "Smile - all that could be seen of the vanishing Cheshire Cat" , "11 smile" .)