The most common and most likely answer to this crossword clue is the 5 letter word OWLET
I've seen this crossword clue in The Times
O
W
L
E
T
More clues leading to the result OWLET
- Young head-turner entering hotel, woman viewed from behind
- Little bird disturbed towel
- Small hooter rousing some hotel workers
- Briefly inform warrant officer about new hooter?
- Show lettuce concealing little bird
- Anything to protect wings of little nestling
- A small bird that hurts tails of all mice, right?
- Chick egg, by the look of it, left in rain
- Know lettings house a fly-by-night
- Crumpled towel – who’ll give a hoot?
Buddy explains!

The straight part
We know that "Small hooter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case small hooter = owlet.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 OWLET mean?
OWLET noun- Any of various birds of prey of the order Strigiformes that are primarily nocturnal and have forward-looking, binocular vision, limited eye movement, and good hearing.
- (by extension) A person seen as having owl-like characteristics, especially appearing wise or serious, or being nocturnally active.
- The owl pigeon.
- A politician with moderate views that are neither hawkish nor dovish.
- Any of various nymphalid butterflies having large eyespots on the wings.
- A young owl; owling.
- One of a species of small owls, such as Athene noctua.
- An owlet moth.