Ensuing diatribe about lute's design (9)
I believe the answer is:
resultant
'ensuing' is the definition.
(thesaurus)
'diatribe about lute's design' is the wordplay.
'diatribe' becomes 'rant' (I've seen this in other clues).
'about' indicates putting letters inside.
'design' indicates an anagram.
'lutes' with letters rearranged gives 'esult'.
'rant' enclosing 'esult' is 'RESULTANT'.
(Other definitions for resultant that I've seen before include "Ensuing, consequent" , "force" .)