Showman, one more involved with Paris (10)
I believe the answer is:
impresario
'showman' is the definition.
(an impresario funds or organises shows)
'one more involved with paris' is the wordplay.
'one' becomes 'i' (Roman numeral).
'involved with' indicates an anagram (involved can mean confusing or complex).
'more' with its letters anagrammed with 'paris' makes 'mpresario'.
'i'+'mpresario'='IMPRESARIO'
(Other definitions for impresario that I've seen before include "Sponsor and manager of public entertainments" , "artistic director" , "Producer of performing arts" , "Promoter of public entertainments" , "Perhaps the Met's manager" .)