Significant other (7)
'significant other' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for partner that I've seen before include "Confederate" , "Business colleague" , "Significant other" , "south to north, perhaps" , "A person dancing with another" .)
'significant other' is the definition.
(I know that lover is a type of concubine)
This is all the clue.
(Other definitions for lover that I've seen before include "Devotee" , "Suitor" , "One has favourite" , "admirer" , "Sweetheart" .)