The most common and most likely answer to this crossword clue is the 8 letter word MAINLAND
I've seen this crossword clue in The Daily Telegraph
M
A
I
N
L
A
N
D
More clues leading to the result MAINLAND
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 MAINLAND mean?
MAINLAND noun- The continent; the principal land, as distinguished from islands or a peninsula.
- The principal island of a group.