Handle can start shaking (8)
I believe the answer is:
transact
'handle' is the definition.
(I've seen this before)
'can start shaking' is the wordplay.
'shaking' is an anagram indicator.
'can'+'start'='canstart'
'canstart' anagrammed gives 'TRANSACT'.
(Other definitions for transact that I've seen before include "Conduct trade" , "Buy or sell" , "Manage" , "Deal with" , "handle" .)