Typify ineptitude, ultimately, with my D.O.B hacked (6)
I believe the answer is:
embody
'typify' is the definition.
(I know that embody is a more specific form of the action the typify)
'ineptitude ultimately with my d o b hacked' is the wordplay.
'ultimately' suggests the final letters.
'with' is a charade indicator (letters next to each other).
'hacked' indicates anagramming the letters (I've seen 'hacking' mean this).
The last letter of 'ineptitude' is 'e'.
'my'+'d'+'o'+'b'='mydob'
'mydob' with letters rearranged gives 'mbody'.
'e'+'mbody'='EMBODY'
(Other definitions for embody that I've seen before include "Express ideas in visible or tangible form" , "Stand for" , "Express concretely - personify" , "concretise" , "Give form to (idea)" .)