The most common and most likely answer to this crossword clue is the 7 letter word NEIGHED
I've seen this crossword clue in The Times
N
E
I
G
H
E
D
More clues leading to the result NEIGHED
- Sounded like filly agitated in hedge
- Made beastly noise, tangled in hedge
- Heeding changes, sounded like members of team?
- Doctor heeding how Arab, for example, sounded
- Last part of serenade we hear uttered in beastly fashion
- Tangled in hedge, sounded like a farm animal
- Ewan, initially in close proximity to Edward, mimicked a horse?
Buddy explains!

The straight part
We know that "Made beastly noise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case made beastly noise = neighed.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 NEIGHED mean?
NEIGHED verb- (of a horse) To make its cry.
- To make a sound similar to a horse's cry.
- To scoff or sneer.