Cryptic crossword clue
20 You get ninny turning up with tree from Java 4

The most common and most likely answer to this crossword clue is the 4 letter word UPAS

I've seen this crossword clue in The Guardian
U
P
A
S

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The straight part
We know that "tree from Java" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tree from java = upas.
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 UPAS mean?

UPAS noun
  1. (usually countable) A tree, Antiaris toxicaria, of the mulberry family, common in the forests of Java and the neighboring islands, with poisonous secretions.
  2. A virulent poison used in Java and the adjacent islands for poisoning arrows derived from the tree.
  3. A poison prepared from the climbing plant Strychnos tieute.

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