Six count in an important way (7)

I believe the answer is:

vitally

I'm a little stuck... Click here to teach me more about this clue!

'in an important way' is the definition.
I can't judge whether this definition defines the answer.

'six count' is the wordplay.
'six' becomes 'vi' (roman numeral).
'count' becomes 'tally' (synonyms).
'vi'+'tally'='VITALLY'

Can you help me to learn more?

(Other definitions for vitally that I've seen before include "Essentially" , "crucially" .)

I've seen this clue in The Hindu.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.