Free to follow a relative (6)
I believe the answer is:
auntie
'relative' is the definition.
(auntie is a kind of relative)
'free to follow a' is the wordplay.
'free' becomes 'untie' (I've seen this before).
'to follow' is a charade indicator (letters next to each other).
'untie' put after 'a' is 'AUNTIE'.
(Other definitions for auntie that I've seen before include "Female relative" , "Relative (familiar)" , "The BBC (coll.)" , "BBC's nickname" , "woman in the family" .)