The most common and most likely answer to this crossword clue is the 3 plus 4 letter word CAR PARK
I've seen this crossword clue in The Guardian
C
A
R
P
A
R
K
More clues leading to the result CAR PARK
- Complain over boat being in place with many bays
- Fishy sanctuary for a lot of Americans?
- Criticise shelter where jaguar, for example, may be foun
- A lot in America fish on boat
- Nag artist that’s rejected one thousand dollars? It may be a lot in US
- Rover may be left here behind shop?
- It may have a standing charge for motorists
- Fish box, where crates are stored
- Where a Plymouth Barracuda may be found – in a fish box!
- Complain boat is where vehicles should be
Buddy explains!

The straight part
We know that "a lot of Americans?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a lot of americans? = car park.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.