Possible Clues:

• Like our boss, wanting slave ultimately for excessive exploitation
• In the past, American English being employed too much
• Strain, as a muscle
• Discovered novel scheme must be exploitation
• Employ excessively
• Stripping lover by deception is exploit­ation
• Strain is universal in pilot's situation, near Heathrow?
• Utilise to excess
• Deplete, perhaps