Hard to fathom good man getting right into obloquy (8)
I believe the answer is:
abstruse
'hard to fathom' is the definition.
'good man getting right into obloquy' is the wordplay.
'good man' becomes 'st'.
'getting right' becomes 'r' (I've seen this in other clues).
'into' is an insertion indicator.
'obloquy' becomes 'abuse'.
'st'+'r'='str'
'str' inserted inside 'abuse' is 'ABSTRUSE'.
(Other definitions for abstruse that I've seen before include "Hard to understand, complicated" , "Difficult to penetrate or understand" , "Incomprehensible to those with normal understanding" , "Obscure or recondite" , "Hard to understand, recondite" .)