Possible Clues:

• Tallinn natives
• People of south-eastern nations in conflict
• Some Balts
• Northern Europeans are a riotous sensation
• New sensation for Europeans
• Europeans succeeded, interrupting public school types
• Citizens of the only country that relies significantly on online voting in elections
• Pupils at a public school, including small Europeans
• Johnson and Cameron, say, bringing in sadness primarily for 18s
• Europeans seeing school head surrounded by pupils