Refutations about Capone, maybe, intercepting gun parts (9)
I believe the answer is:
rebuttals
'refutations' is the definition.
(rebuttal is a kind of refutation)
'about capone maybe intercepting gun parts' is the wordplay.
'about' becomes 're' (regarding).
'capone maybe' becomes 'al' (Al Capone).
'intercepting' indicates putting letters inside (I've seen this in other clues).
'gun parts' becomes 'butts'.
'al' inserted inside 'butts' is 'buttals'.
're'+'buttals'='REBUTTALS'
(Other definitions for rebuttals that I've seen before include "they defeat argument" , "Refutations, contradictions" .)