Cryptic crossword clue
American uncle and I get last letter with incomplete date — it's Soviet contraband self-publishing 8

The most common and most likely answer to this crossword clue is the 8 letter word SAMIZDAT

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Buddy explains!

The straight part
We know that "it's Soviet contraband self-publishing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it's soviet contraband self-publishing = samizdat.
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.

What does SAMIZDAT mean?

SAMIZDAT noun
  1. The secret copying and sharing of illegal publications, chiefly in the Soviet Union; underground publishing and its publications.
  2. A samizdat publication.

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