The most common and most likely answer to this crossword clue is the 10 letter word CONSCIENCE
I've seen this crossword clue in The Guardian
C
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More clues leading to the result CONSCIENCE
- Does this tell you what’s wrong with Conservative nieces misbehaving?
- Argument against technique making moral sense
- Personal guide to study old subject
- Discipline at the bottom of Tory superego
- Scruples against knowledge based on experiments
- Study to gain knowledge and moral insight
- Conservative on discipline and morals
- Moral determinant that’s against genetics, say?
- Study subject in school that gives moral guidance
- The still, small voice opposed to logical observation?
Buddy explains!

The straight part
We know that "superego" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case superego = conscience.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 CONSCIENCE mean?
CONSCIENCE noun- The moral sense of right and wrong, chiefly as it affects one's own behaviour.
- (chiefly fiction) A personification of the moral sense of right and wrong, usually in the form of a person, a being or merely a voice that gives moral lessons and advices.
- Consciousness; thinking; awareness, especially self-awareness.