The most common and most likely answer to this crossword clue is the 9 letter word THEORETIC
I've seen this crossword clue in The Guardian
T
H
E
O
R
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T
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C
More clues leading to the result THEORETIC
- Heavy drinker snaffling Scandinavian funds on time? It’s not proven
- Cite other changes, being purely speculative
- Cite other changes being purely speculative
- Article concerning appetite heartlessly impractical
- Abstract, article or quote in review
- Sent back quote with egg mass and height being speculative
Buddy explains!
The straight part
We know that "It’s not proven" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s not proven = theoretic.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 THEORETIC mean?
THEORETIC adjective- Concerned with theories or hypotheses rather than with practical matters.
- Existing only in theory, not proven in reality.