The most common and most likely answer to this crossword clue is the 4 letter word UFOS
I've seen this crossword clue in The Times
U
F
O
S
More clues leading to the result UFOS
- Some aliens of Universe to go around in these?
- States field officer should cut unexplained overheads?
- Some inhabitants of Uranus taking a spin in these?
- Not American, famous flying objects?
- Mysterious travellers returned from occupying country
- Little green men are regularly buffoons
- 14 saucers have following over in America
- They are, originally, unknowns from outer space
- In which space travellers allegedly returned from moons of Uranus
- They are initially thought to come from outer space
Buddy explains!

The straight part
We know that "unexplained overheads?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unexplained overheads? = ufos.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 UFOS mean?
UFOS noun- A UFO.