Debate conclusion with the genuine and spiritual (8)
I believe the answer is:
ethereal
'spiritual' is the definition.
(I've seen this before)
'debate conclusion with the genuine' is the wordplay.
'conclusion' suggests the final letters.
'with' means one lot of letters go next to another.
'genuine' becomes 'real' (associated in meaning).
The last letter of 'debate' is 'e'.
'e'+'the'+'real'='ETHEREAL'
'and' acts as a link.
(Other definitions for ethereal that I've seen before include "Heavenly - fairy-like" , "Delicate and perfect" , "Insubstantial, other-worldly" , "Having great lightness and delicacy" , "Take ale there: it's light and delicate" .)