The most common and most likely answer to this crossword clue is the 9 letter word DOORPLATE
I've seen this crossword clue in The Times
D
O
O
R
P
L
A
T
E
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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 DOORPLATE mean?
DOORPLATE noun- A plaque mounted on a door, bearing information about the occupant of a room or building.