The most common and most likely answer to this crossword clue is the 9 letter word SAW-EDGED
I've seen this crossword clue in Financial Times
S
A
W
-
E
D
G
E
D
Buddy explains!
The straight part
We know that "having teeth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having teeth = saw-edged.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 SAW-EDGED mean?
SAW-EDGED adjective- Edged with teeth, as a saw; serrated.