Possible Clues:

• From vineyards, a wine offered up to religious zealot
• Campaigner is less prepared when touring South Africa
• One engaged in a Red Cross operation?
• Group's helper said to be a man on a mission
• Vineyard given to down-hearted sovereign such as Richard I
• One of the 11 less sophisticated, going round South Africa
• Leaders of Saracens held by less refined religious warrior
• Activist for reform
• Militant believer's game to invest in sacred operation
• Costa Rica and America raise revolutionary activist