The most common and most likely answer to this crossword clue is the 11 letter word CYLINDRICAL
I've seen this crossword clue in The Guardian
C
Y
L
I
N
D
R
I
C
A
L
Buddy explains!

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 CYLINDRICAL mean?
CYLINDRICAL adjective- Shaped like a cylinder.
- Describing a map projection in which meridians are mapped onto vertical lines and parallels of latitude onto horizontal lines.