The most common and most likely answer to this crossword clue is the 3 plus 6 letter word OFF STREET
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Buddy explains!
The straight part
We know that "where to park" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case where to park = off street.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.
What does OFF STREET mean?
OFF STREET adjective- Not situated on a street; e.g. off-street parking, in contrast to parking on a street.