Related Clues:

• Imposing residence, perhaps fortified
• Chess piece and grand house
• Large fortified building
• Retain in old castle (4)
• Keep a rook on board
• You won't give anything away if you look up to it
• Keep this on board for a rook
• No, Sir, that scrap is up at the barracks
• If there's a rook on board, keep it
• Is it for the army, that fish? No, Sir, it's up to there
• No, sir! The scrap is back for the military
• There's a rook on board
• Keep fifty in class
• Keep a rock on board
• Just look up at the castle!