The most common and most likely answer to this crossword clue is the 11 plus 3 letter word OBSERVATION CAR
I've seen this crossword clue in The Daily Telegraph
O
B
S
E
R
V
A
T
I
O
N
C
A
R
More clues leading to the result OBSERVATION CAR
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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.