Brief result of amateur boxing scam (7)
I believe the answer is:
laconic
'brief' is the definition.
(synonyms)
'amateur boxing scam' is the wordplay.
'amateur' becomes 'laic' (I can't justify this - if you can you should believe this answer much more).
'boxing' indicates putting letters inside ('box' can mean contain, as in to put in a box).
'scam' becomes 'con' (both can mean a fraudulent scheme).
'laic' enclosing 'con' is 'LACONIC'.
'result of' is the link.
Can you help me to learn more?
(Other definitions for laconic that I've seen before include "with little expression" , "Conical (anag) - pithy" , "Saying little" , "'Curt, terse (7)'" , "Spartan" .)