The most common and most likely answer to this crossword clue is the 8 letter word RESOUNDS
I've seen this crossword clue in The Guardian
R
E
S
O
U
N
D
S
More clues leading to the result RESOUNDS
Buddy explains!

The straight part
We know that "Echoes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case echoes = resounds.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 RESOUNDS mean?
RESOUNDS verb- To echo (a sound) or again sound.
- To reverberate with sound or noise.
- To make a reverberating sound.
- To be much mentioned.
- To throw back, or return, the sound of; to echo.
- To praise or celebrate with the voice, or the sound of instruments; to extol with sounds; to spread the fame of.