Related Clues:

• One tending livestock
• Sun might upset one who's up in arms?
• Thin mugs (anag.)
• Old mailman?
• Smug hint about firearm repairer
• Worker with small arms finds Cambridge college hard after comfortable upbringing
• Arms manufacturer's comfortable in retrospect with broadcast fiction
• One who profits from keeping people up in arms
• One works with lifeless arms
• A Royal Mail server, powerless as a mail keeper
• Firearms maker/dealer
• He prepares the magazine with pieces on American university hospital
• Custodian of pieces etc?
• One makes or sells small firearms
• Prepares Arsenal, as those doing the shooting are relying on him