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there is no roof in the clock tower courtyard.
you go to the paved courtyard and get the portable swamp
The fountain is in the middle of the courtyard. Ask Nearly Headless Nick to guide you there if you don't know how to get there.
you put a spell on one of Fred and George's potion
great hall, entrance courtyard, clock tower, viaduct entrance, library
You quit the game, click on 'New Game' from the menu and do it all again.
On the PS3 version, you must climb up on the far wall and mend the roof to recover the portable swamp.
It was a family heirloom. (Not clock, cloak;)
you go to the clock tower courtyard; there are three people. theyll ask youto swap gobstones for it so get some gobstone!
On the clock.
In the Great Hall on the middle table half way down, in the Clock Tower Courtyard in front of the fountain, Entrance courtyard to the right under some leaves, Viaduct entrance in front of the book case, In the library on the table in the middle.
Under a pile of leaves in the clock tower courtyard.