Clumsy butchering of the samurai (10)
I believe the answer is:
amateurish
'clumsy' is the definition.
(thesaurus)
'butchering of the samurai' is the wordplay.
'butchering of' indicates an anagram.
'the'+'samurai'='thesamurai'
'thesamurai' is an anagram of 'AMATEURISH'.
(Other definitions for amateurish that I've seen before include "Lay" , "done imperfectly" , "using little craft, perhaps" , "rather inept" , "Unprofessional" .)