Publication I discontinue, about one stage performer (8)
I believe the answer is:
magician
'stage performer' is the definition.
'publication i discontinue about one' is the wordplay.
'publication' becomes 'mag' (abbreviation for magazine).
'discontinue' becomes 'can' (can can mean to cancel or axe).
'about' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'can' going around 'i' is 'cian'.
'mag'+'i'+'cian'='MAGICIAN'
(Other definitions for magician that I've seen before include "Prestidigitator" , "Conjuror, wizard" , "Person with a wand or rabbit in his hat?" , "Conjurer, illusionist" , "A stage illusionist, or cartoon Mandrake" .)