Attendant welcoming a charter for ancestry (9)
I believe the answer is:
parentage
'ancestry' is the definition.
('parentage' can be a synonym of 'ancestry')
'attendant welcoming a charter' is the wordplay.
'attendant' becomes 'page' (page is a kind of attendant).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'charter' becomes 'rent' ('rent' can be a synonym of 'charter').
'a'+'rent'='arent'
'page' going around 'arent' is 'PARENTAGE'.
'for' is the link.
(Other definitions for parentage that I've seen before include "Ancestry" , "Ancestors" , "Who's your father (and mother)?" , "Family origins" , "child-minders" .)