Possible Clues:

• Asia's got this by the blooming hundred
• One would be a blooming fool to be in American Intelligence
• Get what's silly into the intelligence of the States
• What a fool you'd be to get into the blooming American intelligence! (6)
• Tree providing senna
• Tree, source of spice in cold continent
• Spies where fool is hiding in tree
• Silly to be in American Intelligence and be so blooming yellow
• Silly to be so yellow in Intelligence
• What a fool you'd be to be in that blooming American Intelligence!