Crossword Genius

Country's pro-Labour slogan? (5)

Ross

I believe the answer is:

congo

'country's' is the definition.
(Congo is an example)

I don't understand the remainder of the clue.

(Other definitions for congo that I've seen before include "Wide river" , "former African nation" , "Brazzaville its capital" , "African river flowing into the South Atlantic" , "It was known as Zaire" .)

I've seen this clue in The Guardian.
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