The most common and most likely answer to this crossword clue is the 4 plus 11 letter word DUAL CARRIAGEWAY
D
U
A
L
C
A
R
R
I
A
G
E
W
A
Y
More clues leading to the result DUAL CARRIAGEWAY
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.