The most common and most likely answer to this crossword clue is the 1 letter word K
I've seen this crossword clue in The Guardian
K
More clues leading to the result K
- Result of severing London borough’s traffic artery?
- Australia: a flag raised welcoming a very Russian literary family
- Very old French bother this country: it’s all over for loser at Borodino
- I am so put out about Special K
- K
- 18 SKINFUL/BESIDES
- K-Y stain unfortunately left after game with hookers
- K FC business, not half struggling, must take in a thousand before ends meet
- K LM and I flipping get around!
- K D Lang’s unnamed toy boy’s half crazy
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 K mean?
K noun- A kilobyte (more formally KB or kB).
- A kilobit (more formally kb), especially in measuring Internet connection.
- Kilometre or kilometres.
- Thousand or thousands.
- The SI measurement value of 1,000
- (texting) OK