Edited local paper that is created by one of those not part of the mainstream (5)
I believe the answer is:
indie
'edited local paper' is the definition.
'indie' can be an answer for 'paper' (I've seen this before). I am not certain of the 'edited local' bit.
'that is created by one of those not part of the mainstream' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'that is' could be 'ie' (short for Latin 'id est', 'that is') and 'ie' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for indie that I've seen before include "Non-mainstream record label" , "(Pop group) not affiliated with a major record company" , "Type of music" , "Category of pop music" , "Branch of pop music" .)