Cryptic crossword clue
Eternally happy European beginning to survey marshy regions 10

The most common and most likely answer to this crossword clue is the 10 letter word EVERGLADES

I've seen this crossword clue in The Times
E
V
E
R
G
L
A
D
E
S

Buddy explains!

The straight part
We know that "marshy regions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case marshy regions = everglades.
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.

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