Part of computer difficult to wear out (8)
I believe the answer is:
hardware
'part of computer' is the definition.
(I know this)
'difficult to wear out' is the wordplay.
'difficult' becomes 'hard' (associated in meaning).
'to' says to put letters next to each other.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'wear' is an anagram of 'ware'.
'hard'+'ware'='HARDWARE'
(Other definitions for hardware that I've seen before include "Household items" , "Physical components of a computer system" , "Military equipment" , "Physical computer items" , "Tackle" .)