Possible Clues:

• Citrus greenhouse
• Greenhouse
• Order for top soldier looks positive on a form for those cultivating Valencia
• Indoor garden where wrath-filled politician loses head
• Place for cultivating fruit and some cereal
• Old Yankee traps park-keeper in hothouse
• Conservatory for growing citrus plants
• Where fruit is grown in circular lines, to conserve heat
• Greenhouse full of citrus trees
• Old man in charge of park — unknown fruit is grown here