The most common and most likely answer to this crossword clue is the 7 letter word DUALISM
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More clues leading to the result DUALISM
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The straight part
We know that "Philosophical doctrine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case philosophical doctrine = dualism.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 DUALISM mean?
DUALISM noun- Duality; the condition of being double.
- The view that the world consists of, or is explicable in terms of, two fundamental principles, such as mind and matter or good and evil.
- The belief that the world is ruled by a pair of antagonistic forces, such as good and evil; the belief that man has two basic natures, the physical and the spiritual.
- The theory, originated by Lavoisier and developed by Berzelius, that all definite compounds are binary in their nature, and consist of two distinct constituents, themselves simple or complex, and having opposite chemical or electrical affinities.