Daughter is positioned to be supplanted (9)
I believe the answer is:
displaced
'be supplanted' is the definition.
(I've seen this before)
'daughter is positioned' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'positioned' becomes 'placed' ('place' can be a synonym of 'position').
'd'+'is'+'placed'='DISPLACED'
'to' is the link.
(Other definitions for displaced that I've seen before include "Moved from its proper position" , "Supplanted" , "Forced to leave home" .)