Possible Clues:

• Lower back pain? Spies a nervous response in it
• Back and hip pain
• Intelligence agency occupied road to Women's Institute - it's a pain in the backside perhaps
• Special US agency receiving a jerk's complaint
• Pain in the hip and back
• Intelligence agency jerk in Salvation Army can be a pain in the you know what!
• Pain around back or hip
• Pain in the back, hip and leg
• Nerve pain
• Intelligence agency jerk in Salvation Army goes painfully down the back