Possible Clues:

• Over the door it must be paid after tea
• Time to demand money to deliver lintel
• Beam of light ran somewhere within
• Crosspiece above a door
• Cross-member of boat or window
• Rushed in very upset about the beam
• ... a crime with a small window of opportunity?
• Beam, having managed to get in the majority on the way up
• Structure dividing a window horizontally
• This must be paid after tea over the door