Special gift Capone put in marquee (6)
I believe the answer is:
talent
'special gift' is the definition.
(a talent is a gift or ability)
'capone put in marquee' is the wordplay.
'capone' becomes 'Al' (gangster Al Capone).
'put in' is an insertion indicator.
'marquee' becomes 'tent' (I've seen this in other clues).
'al' placed inside 'tent' is 'TALENT'.
(Other definitions for talent that I've seen before include "skills" , "Attractive people" , "Gift, flair" , "ancient currency" , "ancient coin" .)