Not accustomed to factory fresh (6)
I believe the answer is:
unused
I believe this clue is a double definition.
'not accustomed to' is the first definition.
(I've seen this before)
'factory fresh' is the second definition.
(I've seen this before)
(Other definitions for unused that I've seen before include "Not utilised" , "hadn't been exploited" , "In mint condition" , "Extra" , "Mint, virgin" .)