A century with nobleman Bill (7)
I believe the answer is:
account
'bill' is the definition.
(synonyms)
'a century with nobleman' is the wordplay.
'century' becomes 'C' (common abbreviation).
'with' means one lot of letters go next to another.
'nobleman' becomes 'count' (count is a kind of nobleman).
'a'+'c'+'count'='ACCOUNT'
(Other definitions for account that I've seen before include "Story; bank service" , "Bill - narrative" , "Reckoning; narrative" , "Narrative; statement" , "News report" .)