The most common and most likely answer to this crossword clue is the 6 letter word SIGMAÂ
I've seen this crossword clue in The Guardian
S
I
G
M
A
Â
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 SIGMAÂ mean?
SIGMAÂ noun- The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient.
- The symbol Σ, used to indicate summation of a set or series.
- The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.