Friendly nation (4)

I believe the answer is:

ally

'friendly nation' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ally that I've seen before include "One on one's side" , "One in cooperation with another" , "Someone with whom one is in league" , "Band together" , "Co-operating person or nation" .)

I've seen this clue in The Independent, The Telegraph, the Newsday.com, the Wall Street Journal, the L.A. Times Magazine, the Family Time, the Newsday, the Universal, The Times, The Mirror and The Guardian.

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