Criminal admitting racket in transported goods (6)
I believe the answer is:
lading
'goods' is the definition.
(lading is a kind of goods)
'criminal admitting racket' is the wordplay.
'criminal' becomes 'lag' (slang term for a prisoner).
'admitting' is an insertion indicator (admit can mean to welcome in or accept).
'racket' becomes 'din' (both can mean a loud noise or disturbance).
'lag' going around 'din' is 'LADING'.
'in transported' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for lading that I've seen before include "Car engine adjustment" , "Bill of ......; ship's manifest" , "Cargo, freight" , "A bill of . . . . . . lists cargo" .)