Everyone still unmarried, apparently not yet settled (4)
I believe the answer is:
owed
'everyone still unmarried' is the definition.
I can't judge whether this definition defines the answer.
'apparently not yet settled' is the wordplay.
'apparently' shows a homophone (sound like).
'not' becomes 'o' (I've seen this in other clues).
'yet settled' becomes 'd' (I can't explain this - if you can you should give a lot more credence to this answer).
'o' sounds like 'owe'.
'owe'+'d'='OWED'
Can you help me to learn more?
(Other definitions for owed that I've seen before include "Outstanding" , "(Sum) due for payment" , "Had an obligation to pay" , "In debt to" , "to be paid" .)