The most common and most likely answer to this crossword clue is the 7 letter word JAGGERY
J
A
G
G
E
R
Y
Buddy explains!
The straight part
We know that "sweetener" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sweetener = jaggery.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 JAGGERY mean?
JAGGERY noun- A traditional unrefined sugar used throughout South and South-East Asia.
- A small-scale production plant that processes sugar cane.