Nigerian secessionist state of the 1960s (6)

I believe the answer is:

biafra

'nigerian secessionist state of the 1960s' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for biafra that I've seen is " Nigerian state declaring independence in 1967".)

I've seen this clue in The Wall Street Journal.

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