The most common and most likely answer to this crossword clue is the 6 plus 2 plus 7 letter word STATUE OF LIBERTY
I've seen this crossword clue in The Daily Telegraph
S
T
A
T
U
E
O
F
L
I
B
E
R
T
Y
More clues leading to the result STATUE OF LIBERTY
- Singular beauty title for extraordinary torch-bearer
- She’s very big in New York
- The most prominent figure in a US city
- Monument Station refit — tube’s affected with loads of yuckiness initially
- Moving feebly, tourist at famous sight in America
- Landmark that’s disturbed by a tourist fleet?
- A tourist by fleet interfered with US landmark
- National icon trusty, albeit worried about backing adversary
Buddy explains!

The straight part
We know that "Landmark" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case landmark = statue of liberty.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.