One-dimensional storyteller touring outskirts of Newcastle (6)
I believe the answer is:
linear
'one-dimensional' is the definition.
(similar in meaning)
'storyteller touring outskirts of newcastle' is the wordplay.
'storyteller' becomes 'liar' (telling stories can mean lying).
'touring' is an insertion indicator (tour can mean to go around).
'outskirts of' means to remove the middle letters (only letters on the outskirts).
'newcastle' with its centre removed is 'ne'.
'liar' placed around 'ne' is 'LINEAR'.
(Other definitions for linear that I've seen before include "Like some ancient scripts" , "(Of narrative) sequential" , "Involving one dimension only" , "In a straight line" , "Consisting of lines" .)