The most common and most likely answer to this crossword clue is the 8 letter word SEA-GIRT
I've seen this crossword clue in Financial Times
S
E
A
-
G
I
R
T
More clues leading to the result SEA-GIRT
Buddy explains!

The straight part
We know that "Like Britain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like britain = sea-girt.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.