The most common and most likely answer to this crossword clue is the 14 letter word VERISIMILITUDE
I've seen this crossword clue in Independent
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More clues leading to the result VERISIMILITUDE
Buddy explains!

The straight part
We know that "authentic look" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case authentic look = verisimilitude.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 VERISIMILITUDE mean?
VERISIMILITUDE noun- The property of seeming true, of resembling reality; resemblance to reality, realism.
- A statement which merely appears to be true.
- Faithfulness to its own rules; internal cohesion.