Idiot gets told off (4)
I believe the answer is:
dolt
'idiot' is the definition.
(I know that idiot can be written as dolt)
'told off' is the wordplay.
'off' indicates an anagram.
'told' anagrammed gives 'DOLT'.
'gets' acts as a link.
(Other definitions for dolt that I've seen before include "Slow-witted type" , "Dimwit" , "Halfwit" , "Dull or stupid fellow" , "Stupid person" .)