Crossword Genius

A Western invasion of one African country or another (6)

Ross

I believe the answer is:

malawi

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'a western' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I don't understand the remainder of the clue.

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(Other definitions for malawi that I've seen before include "It was Nyasaland under Britain" , "Country W. of Lake Nyasa" , "African nation, formerly Nyasaland" , "Central African country" , "Landlocked African country" .)

I've seen this clue in The Guardian.
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