The most common and most likely answer to this crossword clue is the 11 plus 1 letter word COMPOSITOR –
I've seen this crossword clue in The Daily Telegraph
C
O
M
P
O
S
I
T
O
R
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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 COMPOSITOR – mean?
COMPOSITOR – noun- A person who sets type; a typesetter.
- One who, or that which, composes or sets in order.