Lintel (7)
I believe the answer is:
transom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lintel</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for transom that I've seen before include "bolstering member" , "Lintel" , "Crossbar over door" , "Cross-member of boat or window" , "Horizontal bar across door for matrons" .)