The most common and most likely answer to this crossword clue is the 10 letter word PENINSULAR
I've seen this crossword clue in The Daily Telegraph
P
E
N
I
N
S
U
L
A
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 PENINSULAR mean?
PENINSULAR noun- One who inhabits a peninsula.
- Of, pertaining to, resembling, or connected with a peninsula.
- Exhibiting a narrow provincialism; parochial.