The most common and most likely answer to this crossword clue is the 5 letter word NEIGH
I've seen this crossword clue in Financial Times
N
E
I
G
H
More clues leading to the result NEIGH
- We hear no sound from a horse
- Heard no horses do this
- Half of the people in our street make a beastly noise
- Sound of Hackney is almost the same as N8
- Beastly sound actually audible
- Refusal reportedly straight from the horse’s mouth?
- We hear no noise from bay perhaps
- Name and number mostly coming from the horse’s mouth
- Sound coming from Ben Nevis in nineteen-eighty
- Sounds like a vote against Arab’s release?
Buddy explains!

The straight part
We know that "noise from bay perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case noise from bay perhaps = neigh.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 NEIGH mean?
NEIGH noun- The cry of a horse.
- (of a horse) To make its cry.
- To make a sound similar to a horse's cry.
- To scoff or sneer.