The most common and most likely answer to this crossword clue is the 8 plus 3 letter word CIRCULAR SAW
I've seen this crossword clue in The Daily Telegraph
C
I
R
C
U
L
A
R
S
A
W
More clues leading to the result CIRCULAR SAW
- Tool for slicing item of junk mail was put into reverse
- Letter saying something sharp
- Blade used to be lifted with letter to open?
- One goes round very quickly and one’s teeth are on edge
- Flier saying something that’s sharp
- Carpenter’s power-driven piece of machinery noticed on flier
- Letter saying it's used in the timber yard
Buddy explains!

The straight part
We know that "One goes round very quickly and one’s teeth are on edge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one goes round very quickly and one’s teeth are on edge = circular saw.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.