Flying, a tremor dislodged beer case (8)
I believe the answer is:
aviation
'flying' is the definition.
(I know that flying can be written as aviation)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for aviation that I've seen before include "Flying in general" , "Mechanical flight" , "Aircraft operating business" , "The business of airlines" , "Air travel" .)