Fine daughter giving assistance (3)
I believe the answer is:
aid
'assistance' is the definition.
(synonyms)
'fine daughter' is the wordplay.
'fine' becomes 'ai' (resembles A1, informal term for top quality).
'daughter' becomes 'd' (genealogical abbreviation).
'ai'+'d'='AID'
'giving' is the link.
(Other definitions for aid that I've seen before include "welfare" , "encouragement" , "Good point" , "A hand" , "Care, assistance" .)