Junior editor with position and wealth (9)
I believe the answer is:
substance
'wealth' is the definition.
(I've seen this before)
'junior editor with position' is the wordplay.
'junior editor' becomes 'sub' (I've seen this before).
'with' means one lot of letters go next to another.
'position' becomes 'stance' (stance is a kind of position).
'sub'+'stance'='SUBSTANCE'
'and' acts as a link.
(Other definitions for substance that I've seen before include "Basic matter" , "power" , "Physical material" , "Matter or material that a thing is made of" , "Physical matter" .)