The most common and most likely answer to this crossword clue is the 7 letter word AUDIBLE
I've seen this crossword clue in The Guardian
A
U
D
I
B
L
E
More clues leading to the result AUDIBLE
- Motor blasted with leaves — not silent
- Yours truly had turned up in gold and black, extremely late for hearing
- German car tooted endlessly within earshot
- Bail due for revision in hearing
- Able to take in under direction, if initially it’s heard
- Car with uneven bulge able to be picked up
- Release bail due in hearing
- “German car’s crap!” — said loud enough to be heard
- Distinct foreign car ran endlessly
- Heard beer includes acceptable offer turning up
Buddy explains!

The straight part
We know that "loud enough to be heard" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case loud enough to be heard = audible.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 AUDIBLE mean?
AUDIBLE noun- The act of or an instance of changing the play at the line of scrimmage by yelling out a new one.
- To change the play at the line of scrimmage by yelling out a new one.
- Able to be heard.