Is it ethical to break a molar? (5)

I believe the answer is:

moral

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'is it ethical' is the definition.
I can't judge whether this definition defines the answer.

'break a molar?' is the wordplay.
'break' is an anagram indicator.
'molar' is an anagram of 'MORAL'.

'to' is the link.

Can you help me to learn more?

(Other definitions for moral that I've seen before include "Relating to good and evil" , "ethical principle" , "Lesson that can be drawn from a story" , "Upright; message of fable" , "Lesson of a fable" .)

I've seen this clue in the Evening Standard.

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