Disorderly — clandestine (6,6)
I believe the answer is:
hugger mugger
I believe this clue is a double definition.
'disorderly' is the first definition.
(similar in meaning)
'clandestine' is the second definition.
(I know that clandestine can be written as hugger-mugger)
(Other definitions for hugger mugger that I've seen before include "undercover" , "secret" , "confusion" , "Confused" .)