Cryptic crossword clue
Trouble penetrating sound barrier 7

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

I've seen this crossword clue in Financial Times
R
A
I
L
I
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G


Buddy explains!

The straight part
We know that "barrier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case barrier = railing.
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 RAILING mean?

RAILING verb
  1. To travel by railway.
  2. To enclose with rails or a railing.
  3. To range in a line.
  4. To criticize severely.
RAILING verb
  1. To complain violently (against, about).
RAILING verb
  1. (of a liquid) To gush, flow.
RAILING noun
  1. A fence or barrier consisting of one or more horizontal rails and vertical supports.

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