Not accustomed to other than second-hand goods? (6)

I believe the answer is:

unused

I'm a little stuck... Click here to teach me more about this clue!

'not accustomed to' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for unused that I've seen before include "factory fresh" , "In mint condition" , "Neither employed nor second-hand" , "Not utilised" , "Left over" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.