Capone's out of the way for ever! (6)
I believe the answer is:
always
'ever' is the definition.
(synonyms)
'capone's out of the way' is the wordplay.
'capone's' becomes 'Al's' (gangster Al Capone).
'out of' indicates putting letters inside (some letters on the outside of others).
'als' placed around 'way' is 'ALWAYS'.
'for' acts as a link.
(Other definitions for always that I've seen before include "Constantly" , "Habitually" , "Eternally" , "Continually" , "Forever, on every occasion" .)