The most common and most likely answer to this crossword clue is the 1 plus 10 letter word A POSTERIORI
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More clues leading to the result A POSTERIORI
- Bill must have perfect gold edging, I learnt from experience
- A stern Head of Inspectorate using evidence
- Seat must have top class cover — a logical way to think
- What’s excellent about seat is discovered from experience
- . Justification requiring more than just reasoning?
- Artificial intelligence to cover the seat was derived from observed facts
- Empirical operator is represented by imaginary number
Buddy explains!

The straight part
We know that "discovered from experience" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case discovered from experience = a posteriori.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.