Take the ring-road in: a new decree (6)

I believe the answer is:

ordain

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'decree' is the definition.
(I know that ordain is a more specific form of the action decree)

'take the ring-road in a new' is the wordplay.
'take the ring' becomes 'o' (I can't explain this - if you can you should give a lot more credence to this answer).
'road' becomes 'rd' (abbreviation).
'new' is an anagram indicator.
'in'+'a'='ina'
'ina' anagrammed gives 'ain'.
'o'+'rd'+'ain'='ORDAIN'

Can you help me to learn more?

(Other definitions for ordain that I've seen before include "Either prescribe" , "Decree authoritatively" , "Appoint - admit to holy orders" , "frock" , "Decree and admit to holy orders" .)

I've seen this clue in the Evening Standard.

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