Current supplier of publication, after tax, getting nothing (7)
I believe the answer is:
magneto
'current supplier' is the definition.
(magneto is a type of electric generator)
'publication after tax getting nothing' is the wordplay.
'publication' becomes 'mag' (abbreviation for magazine).
'after tax' becomes 'net' (as in net profits).
'getting' says to put letters next to each other.
'nothing' becomes 'O' (looks like zero - 0).
'mag'+'net'+'o'='MAGNETO'
'of' is the link.
(Other definitions for magneto that I've seen before include "generation device" , "kindles a spark" , "engine part" , "Small electric generator" , "Car generator" .)