It's not gross to be into witchcraft, it's attractive (8)
I believe the answer is:
magnetic
'attractive' is the definition.
(synonyms)
'it's not gross to be into witchcraft' is the wordplay.
'it's not gross' becomes 'net' ('net' is the opposite to 'gross').
'to be into' is an insertion indicator.
'witchcraft' becomes 'magic' (I've seen this before).
'net' going into 'magic' is 'MAGNETIC'.
'it's' acts as a link.
(Other definitions for magnetic that I've seen before include "Attracting iron or steel" , "Having the power to attract" , "attractive result" , "Drawing" , "Having the property of attracting iron" .)