The most common and most likely answer to this crossword clue is the 6 letter word DIDDLY
I've seen this crossword clue in The Times
D
I
D
D
L
Y
More clues leading to the result DIDDLY
Buddy explains!

The straight part
We know that "In America, nothing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in america, nothing = diddly.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 DIDDLY mean?
DIDDLY noun- A small amount of no worth.
- A written representation of a trill sound.
- (sometimes childish) penis