Pinter, strangely, to accept one's original (8)
I believe the answer is:
pristine
'original' is the definition.
(thesaurus)
'pinter strangely to accept one's' is the wordplay.
'strangely' is an anagram indicator.
'to accept' is an insertion indicator.
'one's' becomes 'is' (roman numeral).
'pinter' anagrammed gives 'prtine'.
'prtine' enclosing 'is' is 'PRISTINE'.
(Other definitions for pristine that I've seen before include "Unchanged or unspoilt" , "Spotless" , "Immaculate" , "Virgin" , "Pure - tire spin (anag)" .)