Turnip oddly added through trifles? (6)
I believe the answer is:
trivia
'trifles?' is the definition.
(I've seen this before)
'turnip oddly added through' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'added' says to put letters next to each other.
'through' becomes 'via' (I've seen this before).
The alternating letters of 'turnip' are 'tri'.
'tri'+'via'='TRIVIA'
(Other definitions for trivia that I've seen before include "Minutiae" , "Unimportant or inconsequential things" , "Trifles, unimportant details" , "Petty details" , "Useless information - trifles" .)