Married before once, and no more than (4)
I believe the answer is:
mere
'no more than' is the definition.
(I've seen this before)
'married before once' is the wordplay.
'married' becomes 'm'.
'before once' becomes 'ere' (archaic word for 'before'**).
'm'+'ere'='MERE'
'and' is the link.
(Other definitions for mere that I've seen before include "Previously pure" , "Lake; simple" , "Pond, only what is said" , "Former lake" , "Nothing more than - water" .)