Wiktionary
having a clue
vb. (present participle of have a clue English)
Usage examples of "having a clue".
If the breakin is so easy you can do it without having a clue what the command “.
Waillan and Dunkin exchanged doubting looks, neither having a clue as to what Deudermont might be talking about.
Not having a clue what was wrong, he changed the subject at once, squeezing a corner of his bulk onto the tiny space that had been reluctantly cleared for him.