Rich boy has nothing on journalist (6)
I believe the answer is:
loaded
'rich' is the definition.
(I've seen this before)
'boy has nothing on journalist' is the wordplay.
'boy' becomes 'lad' (lad is a kind of boy**).
'has' indicates putting letters inside.
'nothing on' becomes 'o' (I've seen this in other clues).
'journalist' becomes 'ed' (short for editor).
'lad' enclosing 'o' is 'load'.
'load'+'ed'='LOADED'
(Other definitions for loaded that I've seen before include "Slangily very rich - or burdened." , "Of gun, containing bullets" , "Cavalry sword" , "drunk- > biased" , "Big Bertha sometimes was" .)