Cryptic crossword clue
USA goes mad substantially lacking boundaries 7

The most common and most likely answer to this crossword clue is the 7 letter word GASEOUS

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "substantially lacking boundaries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case substantially lacking boundaries = gaseous.
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 GASEOUS mean?

GASEOUS adjective
  1. Relating to, or existing as, gas.
  2. Of a liquid containing bubbles: gassy.
  3. Tenuous or indefinite.

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