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 L.A. Times Magazine, The Mirror, the Newsday.com, the Newsday, The Independent, the Family Time, the Universal, the Wall Street Journal, The Times, The Telegraph and The Guardian.

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