The most common and most likely answer to this crossword clue is the 7 letter word FALSEST
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The straight part
We know that "extremely artificial" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extremely artificial = falsest.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 FALSEST mean?
FALSEST adjective- Untrue, not factual, factually incorrect.
- Based on factually incorrect premises.
- Spurious, artificial.
- Of a state in Boolean logic that indicates a negative result.
- Uttering falsehood; dishonest or deceitful.
- Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous.
- Not well founded; not firm or trustworthy; erroneous.
- Not essential or permanent, as parts of a structure which are temporary or supplemental.
- Used in the vernacular name of a species (or group of species) together with the name of another species to which it is similar in appearance.
- Out of tune.