One not taking serious interest in line penned by storyteller? Recalled it beside the gallows (15)

'one not taking serious interest' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'line penned by storyteller? recalled it beside the gallows' is the wordplay.
I cannot really see how this works, but
'line' could be 'l' and 'l' is located in the answer.
'storyteller?' could be 'fibber' ('fibber' can be a synonym of 'storyteller') and 'fibber' is found in the leftover letters.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
'gallows' could be 'gibbet' ('gibbet' can be a synonym of 'gallows') and 'gibbet' is found within the answer.
A single letter 'i' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?