You do so as a matter of policy (6)

I believe the answer is:

insure

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'you do so' is the definition.
I can't judge whether this definition defines the answer.

'a matter of policy' is the wordplay.
'a matter' becomes 'in' (In is an example).
'of policy' becomes 'sure' (I can't explain this - if you can you should give a lot more credence to this answer).
'in'+'sure'='INSURE'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for insure that I've seen before include "Take out a policy" , "Rue sin (anag)" , "Provide protection against risk or damage" , "Guarantee against loss" , "Arrange for payment in the event of loss" .)

I've seen this clue in the Evening Standard.

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