Possible Clues:

• Contamination
• 9 this from recycled plutonium — guards look back, leaving depleted uranium
• Cut up over airport concealing current contamination
• Toxic waste
• Harmful contamination
• Two quid with you in the drink in enough to spoil it all
• Smog, e.g.
• 12 across would have none of it
• The 9 across of 25 down