Possible Clues:

• After time, 'Swallows and Amazons' author almost makes one beam
• Bar very much upset about endless tirade
• Ready for release after time in part of ship
• Romans struggled under the first beam
• Matron's breaking into bar through window
• Boat's flat stern — horizontal beam
• It may appear as smart on the stern of a boat
• Hinged window over a door
• Part of it ran so majestically across the window
• Cross member of Parliament's last to redeem