The most common and most likely answer to this crossword clue is the 8 letter word CLANGOUR
I've seen this crossword clue in The Guardian
C
L
A
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More clues leading to the result CLANGOUR
- Uproar as monkey hides duck beneath cape
- Caught monkey pinching old racket
- Broadcast embarrassing mistake, causing uproar
- Dog carries along mobile making ringing sound
- Boob reportedly making a lot of noise
- Continuous ringing reduced what’s spoken in legal setting, mostly
- Loud noise having caught monkey eating duck
- Group shot — as individual characters you are forming a row
- Carol sung badly — son out making loud noise
- Result of strikes in the metal industry
Buddy explains!

The straight part
We know that "a lot of noise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a lot of noise = clangour.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 CLANGOUR mean?
CLANGOUR noun- A loud, repeating clanging sound; a loud racket; a din.
- To make a clanging sound.