Related Clues:

• Read about king, robust
• Well-built bouncer finally included in investigation
• Rather thick, putting an R in 'investigate'
• Read about brewer's last stout?
• Think about head of rival firm
• Strong king in his counting-house?
• Solid work at University perhaps involves Republican
• Solid, like an oak
• Stout, last of beer, locked in room
• Firm resistance: read all about it
• Hard reading about arithmetic?
• Unlikely to tip
• Twenty-four hours without any answers for firm
• Stalwart Republican in reading room
• Robustly made