Article taken to set free a relative (6)
I believe the answer is:
auntie
'a relative' is the definition.
(I know that auntie is a type of kinswoman)
'article taken to set free' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'taken' is a charade indicator (letters next to each other).
'to set free' becomes 'untie' (I've seen this before).
'a'+'untie'='AUNTIE'
(Other definitions for auntie that I've seen before include "woman in the family" , "Relative (familiar)" , "Name for BBC" , "Relation; the BBC" , "BBC; relative (colloq,)" .)