Lively grammarian’s voice? (6)
I believe the answer is:
active
This clue is a double definition.
'lively' is the first definition.
('active' can be similar in meaning to 'lively')
'grammarian's voice?' is the second definition.
(voice in grammar)
(Other definitions for active that I've seen before include "Industrious" , "Not extinct (of volcano)" , "In actual operation" , "Moving, doing things" , "Working; moving" .)