Disciple uncovered Mafia don — ciao! — shot (10)
I believe the answer is:
aficionado
'disciple' is the definition.
(thesaurus)
'uncovered mafia don ciao shot' is the wordplay.
'uncovered' means to look at the middle letters.
'shot' is an anagram indicator.
The middle of 'mafia' is 'afi'.
'don'+'ciao'='donciao'
'donciao' is an anagram of 'cionado'.
'afi'+'cionado'='AFICIONADO'
(Other definitions for aficionado that I've seen before include "Fan; enthusiast" , "Admirer" , "Informed enthusiast" , "supporter" , "Devotee" .)