Relative without a daughter freed (6)
I believe the answer is:
untied
'freed' is the definition.
(I've seen this in another clue)
'relative without a daughter' is the wordplay.
'relative' becomes 'aunt' (aunt is a type of relative).
'without' is a deletion indicator.
'daughter' becomes 'ied' (I can't explain this - if you can you should believe this answer much more).
'aunt' with 'a' removed is 'unt'.
'unt'+'ied'='UNTIED'
Can you help me to learn more?
(Other definitions for untied that I've seen before include "Disconnected" , "Released from 19" , "Undid the knot" , "'Unfastened, lace say (6)'" , "Loosened" .)