Set out with number of commandments or principles (6)
I believe the answer is:
tenets
'principles' is the definition.
(I know this)
'set out with number of commandments' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'with' means one lot of letters goes inside another.
'number of commandments' becomes 'ten' (the Ten Commandments).
'set' anagrammed gives 'ets'.
'ets' placed around 'ten' is 'TENETS'.
'or' is the link.
(Other definitions for tenets that I've seen before include "gnomes?" , "Principles of belief" , "Doctrines of belief" , "Conviction" , "Doctrines held to be true" .)