Unimportant details (6)
I believe the answer is:
trivia
'unimportant details' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for trivia that I've seen before include "Non-essential data" , "minor points of interest?" , "Unimportant things or details" , "petty considerations" , "Unimportant or inconsequential things" .)