Triple via details that aren’t significant (6)
I believe the answer is:
trivia
'details that aren't significant' is the definition.
'trivia' can be an answer for 'details' (I've seen this before). I am unsure of the rest of the definition.
'triple via' is the wordplay.
'triple' becomes 'tri' (I can't explain this - if you can you should believe this answer much more).
'tri'+'via'='TRIVIA'
Can you help me to learn more?
(Other definitions for trivia that I've seen before include "Unimportant or inconsequential things" , "Unimportant facts" , "useless bits of information?" , "Petty details" , "relatively unimportant matters" .)