Couple married in Soweto separated (7)
I believe the answer is:
twosome
'couple' is the definition.
(synonyms)
'married in soweto separated' is the wordplay.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'in' means one lot of letters goes inside another.
'separated' indicates anagramming the letters (letters separated and rearranged).
'soweto' anagrammed gives 'twosoe'.
'm' placed inside 'twosoe' is 'TWOSOME'.
(Other definitions for twosome that I've seen before include "game of golf" , "Item" , "Pair, duo" , "Couple" , "match" .)