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Theres some point in a story having one (5)

Ross

I believe the answer is:

moral

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'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.

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(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" .)

I've seen this clue in The Irish News.
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