The most common and most likely answer to this crossword clue is the 7 letter word BOULDER
I've seen this crossword clue in The Guardian
B
O
U
L
D
E
R
More clues leading to the result BOULDER
- Listened to more ambitious rock
- Heavy rock can be more in your face, I heard
- Rock bass getting louder when played
- Large rock making more noticeable sound
- Stone with more grit, by the sound of it
- For the audience, more progressive rock?
- Rock more noticeable, by the sound of it?
- Reportedly more daring challenge for climbers
- A hard place in Colorado
- Listen to more adventurous rock
Buddy explains!

The straight part
We know that "Large rock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large rock = boulder.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 BOULDER mean?
BOULDER noun- A large mass of stone detached from the surrounding land.
- A particle greater than 256 mm in diameter, following the Wentworth scale
- A large marble, in children's games.
- A session of bouldering; involvement in bouldering.
- To engage in bouldering.