A story, and not one to pass on legally (7)
I believe the answer is:
alienor
'on legally' is the definition.
I can't tell whether this defines the answer.
'a story and not one to pass' is the wordplay.
'story' becomes 'lie' (story can mean a fabrication).
'and not' becomes 'nor' (I've seen this before).
'one to pass' says to put letters next to each other.
'a'+'lie'+'nor'='ALIENOR'
Can you help me to learn more?
(Other definitions for alienor that I've seen before include "One disposing of property" , "Property expert" .)