CLUE, HAVE NO

(informal) are completely uncertain of what to do, what is correct, etc. —SHSBC Binder 30 Approved Glossary

(informal) are completely uncertain of what to do, what is correct, etc.have no idea; know nothing (about something). You, frankly, have no clue what you're getting into because he's way-out, man. (informal) are completely uncertain of what to do, what is correct, etc. You, frankly, have no clue what you're getting into because he's way-out, man. TStudying Data Assimilation (9 July 64)