Cryptic crossword clue
Oe’r such you may wander when National Trust gets involved 7,5

The most common and most likely answer to this crossword clue is the 7 plus 5 letter word COUNTRY HOUSE

I've seen this crossword clue in The Daily Telegraph
C
O
U
N
T
R
Y
H
O
U
S
E

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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.

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