Possible Clues:

• One of the key men provides security at the state's college hospital
• Maker of security devices
• A source of amusement to those in love
• One with a key job?
• One making secure fasteners
• 'He'll have the key to being a hairdresser, perhaps (9)'
• Yale scholar?
• Tradesman bolts on hearing story
• One who fixes key position in ward?
• Security device maker