Possible Clues:

• Bed chamber moustache fertilizer
• If the saucepan has got burnt, that makes it more fertile
• Potassium carbonate or hydroxide
• Alkali used as fertiliser
• To have burnt the saucepan will make it more fertile
• Volunteers billeted in superior compound
• Footballer's wife without reserve could be caustic
• An alkali
• Army to occupy exclusive compound
• Volunteers accommodated in upper-class compound