Daughter is to run for release (9)
I believe the answer is:
discharge
'for release' is the definition.
(synonyms)
'daughter is to run' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'to run' becomes 'charge' ().
'd'+'is'+'charge'='DISCHARGE'
(Other definitions for discharge that I've seen before include "Acquit" , "pay" , "Sack or fire weapon" , "Fire (a gun); release from custody" , "unload" .)