The most common and most likely answer to this crossword clue is the 6 letter word LINTEL
I've seen this crossword clue in The Guardian
L
I
N
T
E
L
More clues leading to the result LINTEL
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LINTEL mean?
LINTEL noun- A horizontal structural beam spanning an opening, such as between the uprights of a door or a window, and which supports the wall above.