I've now got a completed grid bar these two 3 letter clues..
Pipe that's the right way up
I've got OA? and wonder if it might be a 'tree' but can't see the pipe reference.
Dead bear sent to be skinned then stuffed by the Academy
I have EA? Thought it might be the middle letters of "sent" around A(cademy) but can find no 'dead bear' reference.