A fruity description (6)
I believe the answer is:
citrus
'a fruity description' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for citrus that I've seen before include "Lemon genus" , "Describing lemons, for example" , "sort of fruit tree" , "Tree such as lemon or lime" , "Orange tree genus" .)