Pair of Americans raring to go off about the country (8)

I believe the answer is:

agrarian

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'country' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for agrarian that I've seen before include "of countryside" , "Relating to farming" , "Of agricultural land or its cultivation" , "Relating to agriculture" , "Ruralist" .)

I've seen this clue in The Independent.

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