Right, so Country is your definition, pointing at KOSOVO. For the build-up: start with KO, a defeat or knockout, then add SO meaning "like that", and finish with VO — V being the Roman numeral for five and O being zero, giving you the "5-0" bit. Worth flagging that "5" here isn't a plain number but a cross-reference to another clue in the grid, 5 down, whose answer is STAPES — though it's the Roman numeral value that's actually used in the wordplay, not the word STAPES itself.