It can save a country from mad policy (9)

I believe the answer is:

diplomacy

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'it can save a country' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'country' relates to this answer.

'from mad policy' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'mad'+'policy'='madpolicy'
'madpolicy' is an anagram of 'DIPLOMACY'.

Can you help me to learn more?

(Other definitions for diplomacy that I've seen before include "Art of negotiation" , "International negotiations" , "See 2" , "Tact" , "Tactful dealing" .)

I've seen this clue in The Globe and Mail.

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