Keep shaking cart (5)
I believe the answer is:
wagon
This might be a double definition.
'keep shaking' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'cart' is the second definition.
(I've seen this before)
(Other definitions for wagon that I've seen before include "Horse-drawn vehicle" , "Railway freight vehicle" , "Van, lorry" , "Trailer, railway truck" , "Freight truck" .)