A free family member (6)

I believe the answer is:

auntie

'family member' is the definition.
(I've seen this before)

'a free' is the wordplay.
'free' becomes 'untie' (I've seen this before).
'a'+'untie'='AUNTIE'

(Other definitions for auntie that I've seen before include "The BBC (coll.)" , "Unite a strange relative" , "BBC's nickname" , "Family relative" , "BBC; relative (colloq,)" .)

I've seen this clue in The Times.

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