Person acquiring a record: disc with loud guitar (8)
I believe the answer is:
offender
'person acquiring a record' is the definition.
(someone getting a criminal record)
'disc with loud guitar' is the wordplay.
'disc' becomes 'O' (disc-shaped letter).
'with' says to put letters next to each other.
'loud' becomes 'f' (short for forte - 'loud' in music).
'guitar' becomes 'fender' (famous guitar manufacturer).
'o'+'f'+'fender'='OFFENDER'
(Other definitions for offender that I've seen before include "Transgressor, lawbreaker" , "guilty party" , "Criminal" , "Culprit" , "One breaking rule" .)