Theres some point in a story having one (5)
I believe the answer is:
moral
'one' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for moral that I've seen before include "Relating to good and evil" , "ethical standard" , "Virtuous and principled" , "Lesson of a fable" , "Behaving ethically" .)