Bill takes it? Yes, primarily for those who will come after (9)
I believe the answer is:
posterity
'those who will come after' is the definition.
(posterity means future generations)
'bill takes it? yes primarily' is the wordplay.
'bill' becomes 'poster' (synonyms).
'takes' says to put letters next to each other.
'primarily' indicates taking the first letters.
The initial letter of 'yes' is 'y'.
'poster'+'it'+'y'='POSTERITY'
'for' is the link.
(Other definitions for posterity that I've seen before include "Succeeding generations" , "Future generations" , "for people coming later" .)