Mean to collect unwrapped part that's second-hand (9)
I believe the answer is:
vicarious
'second-hand' is the definition.
(I've seen this before)
'mean to collect unwrapped part' is the wordplay.
'mean to' becomes 'vicious' (I am not sure about this - if you are sure you should believe this answer much more).
'collect' is an insertion indicator.
'unwrapped' means to look at the middle letters (the letters which wrap the word are removed).
The central letters of 'part' are 'ar'.
'vicious' enclosing 'ar' is 'VICARIOUS'.
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for vicarious that I've seen before include "taking another's place" , "Substitutionary" , "Indirect" , "second hand" , "Replacing another" .)