My clue confused lecture hall (6)
I believe the answer is:
lyceum
'lecture hall' is the definition.
(I've seen this in another clue)
'my clue confused' is the wordplay.
'confused' is an anagram indicator.
'my'+'clue'='myclue'
'myclue' with letters rearranged gives 'LYCEUM'.
(Other definitions for lyceum that I've seen before include "Aristotle's garden" , "Lecture-hall" , "Ancient Greek school" , "School of thought" , "Athenian garden where Aristotle taught" .)