Kind of language Nero used (8)
I believe the answer is:
generous
'kind' is the definition.
(similar in meaning)
'of language nero used' is the wordplay.
'of' indicates a hidden word.
'GENEROUS' is hidden in the letters of 'language nero used'.
(Other definitions for generous that I've seen before include "Munificent; liberal" , "Willing to give unselfishly" , "Giving unselfishly" , "Kind towards others" , "Ample" .)