Notwithstanding some original thoughts (8)
I believe the answer is:
although
'notwithstanding' is the definition.
(thesaurus)
'some original thoughts' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ALTHOUGH' can be found hidden inside 'original thoughts'.
(Other definitions for although that I've seen before include "However, but" , "Whilst" , "Apart from the fact that" , "Notwithstanding" , "Yet" .)