The most common and most likely answer to this crossword clue is the 8 letter word YOSEMITE
I've seen this crossword clue in Financial Times
Y
O
S
E
M
I
T
E
More clues leading to the result YOSEMITE
- Some yeti seen roaming mountain valley
- Three times oyster content gets sent back in US national park
- American greeting English newspaper turning up in US National Park
- House in miniature around back of Hyde Park
- See toy I’m flying in National Park
- Yankee, small child following ring on banks of skate park
- Old house, first of three in the old park
- Some Tokyo semi-terraced park, where Sam lives
- National park greeting Jew or Arab?
- Some yeti going around national park
Buddy explains!
The straight part
We know that "National Park" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case national park = yosemite.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.