Perhaps Norton is against six; primarily routing everyone (9)

I believe the answer is:

antivirus

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'perhaps norton' is the definition.
I can't judge whether this defines the answer.

'against six primarily routing everyone' is the wordplay.
'against' becomes 'anti' (prefix meaning against).
'six' becomes 'VI' (Roman numerals).
'primarily' says to take the initial letters.
'everyone' becomes 'us' (I can't justify this - if you can you should believe this answer much more).
The initial letter of 'routing' is 'r'.
'anti'+'vi'+'r'+'us'='ANTIVIRUS'

'is' is the link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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