Usual idiot sucked up along the way (9)
I believe the answer is:
customary
'usual' is the definition.
(similar in meaning)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for customary that I've seen before include "Commonly used or practised" , "Conventional" , "Normal, usual" , "Courts may find this usual" , "precedent" .)