The most common and most likely answer to this crossword clue is the 3 letter word HAW
I've seen this crossword clue in The Daily Telegraph
H
A
W
More clues leading to the result HAW
Buddy explains!

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 HAW mean?
HAW verb- To stop, in speaking, with a sound like haw; to speak with interruption and hesitation.
- An imitation of laughter, often used to express scorn or disbelief. Often doubled or tripled (haw haw or haw haw haw).
- An intermission or hesitation of speech, with a sound somewhat like "haw"; the sound so made.
- Fruit of the hawthorn.
- A hedge.
- (of an animal) To turn towards the driver, typically to the left.
- To cause (an animal) to turn left.
- An instruction for a horse or other animal to turn towards the driver, typically left (See gee).
- The third eyelid, or nictitating membrane.
- A disease of the nictitating membrane.