Record one way traitor enters area (12)

I believe the answer is:

registration

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'record' is the definition.

'one way traitor enters area' is the wordplay.
'one way traitor' becomes 'strati' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'enters' indicates putting letters inside.
'area' becomes 'region' (synonyms).
'strati' inserted inside 'region' is 'REGISTRATION'.

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(Other definitions for registration that I've seen before include "Formal enrolment" , "Car ID" , "Vehicle identifier" , "recording" , "Car number" .)

I've seen this clue in The Guardian.

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