The most common and most likely answer to this crossword clue is the 9 plus 6 letter word WIMBLEDON COMMON
I've seen this crossword clue in The Guardian
W
I
M
B
L
E
D
O
N
C
O
M
M
O
N
More clues leading to the result WIMBLEDON COMMON
Buddy explains!
The straight part
We know that "park here" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case park here = wimbledon common.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.