Cur's led on shaking dog (9)
I believe the answer is:
scoundrel
'dog' is the definition.
(both can mean a dishonourable person)
'cur's led on shaking' is the wordplay.
'shaking' indicates anagramming the letters.
'curs'+'led'+'on'='cursledon'
'cursledon' anagrammed gives 'SCOUNDREL'.
(Other definitions for scoundrel that I've seen before include "A rogue or dishonest person" , "Untrustworthy figure" , "Disreputable type" , "Hound" , "Cad" .)