Translation of banal epic not up to the job (9)
I believe the answer is:
incapable
'not up to the job' is the definition.
(I've seen this in another clue)
'translation of banal epic' is the wordplay.
'translation of' indicates an anagram (translate can mean to transform).
'banal'+'epic'='banalepic'
'banalepic' anagrammed gives 'INCAPABLE'.
(Other definitions for incapable that I've seen before include "hopeless" , "Extremely drunk" , "lacking ability" , "Useless" , "helpless" .)