Shake object in stone (7)
I believe the answer is:
agitate
'shake' is the definition.
(I know that shake can be written as agitate)
'object in stone' is the wordplay.
'object' becomes 'it' (pronoun for an inanimate object).
'in' means one lot of letters goes inside another.
'stone' becomes 'agate' (agate is a type of stone).
'it' put into 'agate' is 'AGITATE'.
(Other definitions for agitate that I've seen before include "Fluster" , "Disturb, cause to worry" , "Unsettle" , "Perturb" , "Foment" .)