Eastern principles some start using the wrong way (5)
I believe the answer is:
sutra
'eastern principles some start using the wrong way' is the definition.
I can't tell whether this defines the answer.
'some start using the wrong way' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'the wrong way' says the letters should be written backwards.
'artus' is hidden in the letters of 'start using'.
'artus' in reverse letter order is 'SUTRA'.
Can you help me to learn more?
(Other definitions for sutra that I've seen before include "Indian rule" , "A Buddhist scripture" , "Buddhist literature" , "Rule or aphorism in Sanskrit literature" , "sacred text" .)