The most common and most likely answer to this crossword clue is the 9 letter word CYCLAMATE
I've seen this crossword clue in The Daily Telegraph
C
Y
C
L
A
M
A
T
E
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 CYCLAMATE mean?
CYCLAMATE noun- Any salt or ester of cyclamic acid, especially the sodium and calcium salts, which have been used as artificial sweeteners