Old silver with journalist (4)
I believe the answer is:
aged
'old' is the definition.
(similar in meaning)
'silver with journalist' is the wordplay.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'with' says to put letters next to each other.
'journalist' becomes 'ed' (short for editor).
'ag'+'ed'='AGED'
(Other definitions for aged that I've seen before include "well over the hill" , "Long in the tooth" , "way over the hill" , "Antiquated" , "Senescent" .)