Familiar with Bill, olde-worlde journalist (10)
I believe the answer is:
acquainted
'familiar with' is the definition.
('acquainted' can be a synonym of 'familiar with')
'bill olde-worlde journalist' is the wordplay.
'bill' becomes 'ac'.
'olde worlde' becomes 'quaint' (I've seen this before).
'journalist' becomes 'ed' (short for editor).
'ac'+'quaint'+'ed'='ACQUAINTED'
(Other definitions for acquainted that I've seen before include "Well-versed" , "Familiar (with)" , "on good terms" , "knowing a little" , "Made aware of" .)