Idiot admitting a case of malpractice in court (7)
I believe the answer is:
camelot
'court' is the definition.
(I've seen this before)
'idiot admitting a case of malpractice in' is the wordplay.
'idiot' becomes 'clot' (both can mean a stupid person).
'admitting' means one lot of letters goes inside another (admit can mean to welcome in or accept).
'case of' means to remove the middle letters (like emptying a case).
'in' means one lot of letters goes inside another.
'malpractice' with its centre taken out is 'me'.
'clot' going around 'a' is 'calot'.
'calot' going around 'me' is 'CAMELOT'.
(Other definitions for camelot that I've seen before include "Arthur's or Kennedy's court?" , "romantic place" , "Legendary court" , "Where truth, goodness and beauty reigned, according to Arthurian legend" , "the Kennedy era" .)