The most common and most likely answer to this crossword clue is the 12 letter word APPURTENANCE
I've seen this crossword clue in Financial Times
A
P
P
U
R
T
E
N
A
N
C
E
More clues leading to the result APPURTENANCE
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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 APPURTENANCE mean?
APPURTENANCE noun- An appendage to something else; an addition.
- (in the plural) Equipment used for some specific task; gear.
- The thing to which another pertains.
- Minor property, such as an outhouse, that passes with the main property when it is sold.
- (grammar) A modifier that is appended or prepended to another word to coin a new word that expresses belonging.