And this, according to Virgil, is a rule to live by (5)

I believe the answer is:

ethic

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'and this according to virgil is a rule to live by' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for ethic that I've seen before include "System of principles" , "Moral system" , "Ideology" , "Set of moral values" , "set of morals" .)

I've seen this clue in The Independent.

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