Cryptic crossword clue
Flies, perhaps, ones that move fast 7

The most common and most likely answer to this crossword clue is the 7 letter word ZIPPERS

I've seen this crossword clue in The Daily Telegraph
Z
I
P
P
E
R
S

Buddy explains!

The straight part
We know that "ones that move fast" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ones that move fast = zippers.
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 ZIPPERS mean?

ZIPPERS noun
  1. A zip fastener.
  2. A pressure-sensitive plastic closure.
  3. Leucine zipper
  4. A scar on a person's body.
  5. An air patrol carried out at dawn or dusk.
ZIPPERS verb
  1. To close a zipper.
  2. To put a zipper on an article.

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