The most common and most likely answer to this crossword clue is the 4 letter word GNAT
G
N
A
T
More clues leading to the result GNAT
- Fly back out of Katanga
- Insect smell after tipping
- Turning, smack annoying flier
- Insect featuring in design, a termite
- Fly in jet, angled westwards
- Coming from behind, smack fly
- Head of green and brown climbing insect
- Fly emperors from the east to the west
- Insect pest in emerging nations
- Insect to dance about endlessly
Buddy explains!

The straight part
We know that "Fly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fly = gnat.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 GNAT mean?
GNAT noun- Any small insect of the order Diptera, specifically within the suborder Nematocera.