Due to moral principles, is out of business (6)
I believe the answer is:
ideals
'due to moral principles' is the definition.
I can't judge whether this definition defines the answer.
'is out of business' is the wordplay.
'out of' means one lot of letters goes inside another (some letters on the outside of others).
'business' becomes 'deal'.
'is' going around 'deal' is 'IDEALS'.
Can you help me to learn more?
(Other definitions for ideals that I've seen before include "Models of perfection" , "Ideas regarded as perfect or standards" , "They're perfect" , "High aspirations for ladies" , "Models of excellance" .)