Getting the job done but using violence (8)
I believe the answer is:
thorough
'getting the job done' is the definition.
I can't tell whether this definition defines the answer.
'but using violence' is the wordplay.
'but' becomes 'tho' (I've seen this in other clues).
'using violence' becomes 'rough' (I can't justify this - if you can you should believe this answer much more).
'tho'+'rough'='THOROUGH'
Can you help me to learn more?
(Other definitions for thorough that I've seen before include "Total - painstaking - in-depth" , "Careful, attending to every detail" , "Paying attention to detail, meticulous" , "Doing things with great attention to detail" , "Carried out completely and carefully" .)