Usually the dope gets really confused (9)
I believe the answer is:
generally
'usually' is the definition.
(thesaurus)
'the dope gets really confused' is the wordplay.
'the dope' becomes 'gen' (I've seen this in other clues).
'gets' means one lot of letters go next to another.
'confused' indicates an anagram.
'really' is an anagram of 'erally'.
'gen'+'erally'='GENERALLY'
(Other definitions for generally that I've seen before include "In most cases, usually" , "For the most part" , "In most cases, as a general rule" , "most of the time" , "Usually, as a rule" .)