Pertaining to wedlock (7)
I believe the answer is:
marital
'pertaining to wedlock' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for marital that I've seen before include "to do with life together" , "Sort of union" , "Of nuptials" , "to do with couple's relationship" , "Of a wedding" .)