Possible Clues:

• Pop round by rail?
• Groove in a board
• Lower section of wall in room
• Would it be enough for your old man to go on the wall?
• Piece of boarded adornment
• Lower part of the wall of a room
• Pop round to see a wall panel
• Beyond a doubt, what's inside is the work of the carpenter
• Old man gets old wall moulding
• Intersecting board groove