The most common and most likely answer to this crossword clue is the 4 letter word YAWP
I've seen this crossword clue in The Daily Telegraph
Y
A
W
P
Buddy explains!

The straight part
We know that "it’s noisy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s noisy = yawp.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 YAWP mean?
YAWP noun- A yelp or bark
- Loud or coarse talk
- To yelp, or utter a sharp cry, as in intense pain, or another raucous noise
- To talk loudly and coarsely
- Clamor, utter loud complaints