Sucre', oft translated as 'sugar (8)
I believe the answer is:
fructose
'sugar' is the definition.
(fructose is a kind of sugar)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for fructose that I've seen before include "Sweetener" , "It's sweet" , "Kind of sugar" , "A simple sugar, in honey for instance" , "Fruit-sugar" .)