Discarnate, but that’s unimportant (10)
I believe the answer is:
immaterial
This clue is a double definition.
'discarnate' is the first definition.
(thesaurus)
'that's unimportant' is the second definition.
(I've seen this before)
'but' is the link.
(Other definitions for immaterial that I've seen before include "unimportant" , "Irrelevant" , "of no importance" .)