The most common and most likely answer to this crossword clue is the 20 letter word CONTRAB&(CONTRABAND)
C
O
N
T
R
A
B
&
(
C
O
N
T
R
A
B
A
N
D
)
Buddy explains!
The straight part
We know that "Goods smuggled" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case goods smuggled = contrab&(contraband).The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.