The first person a state prosecutor married (4)
I believe the answer is:
adam
'the first person' is the definition.
(biblical first person created)
'a state prosecutor married' is the wordplay.
'state prosecutor' becomes 'da' (district attorney).
'married' becomes 'm'.
'a'+'da'+'m'='ADAM'
(Other definitions for adam that I've seen before include "father of us all?" , "man expelled from garden" , "__ Smith, author of The Wealth of Nations" , "First man of Genesis" , "the first orphan?" .)