The most common and most likely answer to this crossword clue is the 12 letter word REDUCTIONISM
I've seen this crossword clue in The Times
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Buddy explains!
The straight part
We know that "Analytical system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case analytical system = reductionism.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 REDUCTIONISM mean?
REDUCTIONISM noun- An approach to studying complex systems or ideas by reducing them to a set of simpler components.
- A philosophical position which holds that a complex system is nothing but the sum of its parts, and that an account of it can be reduced to accounts of individual constituents. In a reductionist framework, the phenomena that can be explained completely in terms of relations between other more fundamental phenomena, are called "epiphenomena".