Related Clues:

• Investigators employed in federal bureau come up with self-discipline
• One preferring their own company
• For such fellow, no mixing
• Self-disciplined person
• Solitary type providing side-splitting joke
• Secure boat properly, say, being solitary
• A solitary person will have a job to conceal it
• Solitary individual dividing opposite sides
• Mixing fellow? No!
• No fellow for mixing
• One shunning society
• Loner about to be given hint — someone's beginning to interrupt
• Mortifying the flesh, like Scottish players left out
• One lacking friends
• Austere as a penniless person full of doubt