Relative brought up Egyptian god that’s obscure (7)
I believe the answer is:
unclear
'obscure' is the definition.
(thesaurus)
'relative brought up egyptian god' is the wordplay.
'relative' becomes 'uncle' (uncle is a kind of relative**).
'brought up' says the letters should be written in reverse (down clues only).
'egyptian god' becomes 'ra' (Ra is an example).
'ra' reversed gives 'ar'.
'uncle'+'ar'='UNCLEAR'
'that's' is the link.
(Other definitions for unclear that I've seen before include "An ulcer (anag)" , "Not transparent or intelligible" , "Not easy to grasp" , "Not distinct in nuclear way" , "Indistinct" .)