The most common and most likely answer to this crossword clue is the 6 letter word GROWLS
G
R
O
W
L
S
Buddy explains!
The straight part
We know that "unpleasant sounds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unpleasant sounds = growls.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 GROWLS mean?
GROWLS noun- A deep, rumbling, threatening sound made in the throat by an animal.
- (by extension) The rumbling sound made by a person's stomach when hungry.
- (by extension) An aggressive grumbling.
- (by extension) A low-pitched rumbling sound produced with a wind instrument.
- To utter a deep guttural sound, as an angry animal; to give forth an angry, grumbling sound.
- Of a wind instrument: to produce a low-pitched rumbling sound.
- To send a user a message via the Growl software library.
- To express (something) by growling.
- To play a wind instrument in a way that produces a low-pitched rumbling sound.