Central African river (5)

I think it could be either:

Which length description are you looking for?:

congo

'central african river' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for congo that I've seen before include "Africa's second longest river" , "African river/republic" , "Major central African river" , "African river (aka Zaire)" , "Africa country and river" .)

I've seen this clue in the Sydney Morning Herald.

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