Possible Clues:

• Baryshnikov, for one
• European city that includes Hollywood set in surrounding area
• Language of one set to wear back-to-front collar
• From one of the Baltics
• European secure in retirement having acquired a source of entertainment
• Language almost dead, going by name
• Nationality of citizen of Riga
• European valiant at sea
• Soviet grandmaster returned by way of northern Baltic
• Valiant constituents of a recently liberated state