The most common and most likely answer to this crossword clue is the 11 letter word UNSUPPORTED
I've seen this crossword clue in The Daily Telegraph
U
N
S
U
P
P
O
R
T
E
D
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 UNSUPPORTED mean?
UNSUPPORTED adjective- Without physical support.
- For which support or help is not available.
- Without confirmation from a credible source, without verifying support