Jumbo perhaps moved ear over tree (9)
I believe the answer is:
aeroplane
'jumbo perhaps' is the definition.
'moved ear over tree' is the wordplay.
'moved ear over' becomes 'aero' (I can't explain this - if you can you should give a lot more credence to this answer).
'tree' becomes 'plane' (plane is a type of tree).
'aero'+'plane'='AEROPLANE'
Can you help me to learn more?
(Other definitions for aeroplane that I've seen before include "Flier" , "Lancaster?" , "Fixed-wing aircraft" , "Spitfire, for example" , "Eg, jumbo jet" .)