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Rule, say, kept in cold storage (6)

Ross

I believe the answer is:

regime

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'rule' is the definition.
(thesaurus)

'say kept in cold storage' is the wordplay.
'say' becomes 'eg'.
'kept in' indicates putting letters inside.
'cold storage' becomes 'rime' (I can't justify this - if you can you should give a lot more credence to this answer).
'eg' going into 'rime' is 'REGIME'.

Can you help me to learn more?

(Other definitions for regime that I've seen before include "Ruling system" , "Emigre (anag.)" , "Dominion of emigre" , "Plan for therapy or government in power" , "Routine" .)

I've seen this clue in The Hindu.
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