Clear off a blackboard (5)
I believe the answer is:
erase
(Other definitions for erase that I've seen before include "Remove all traces of" , "Take out" , "Remove evidence of" , "Remove, wipe out" , "Obliterate" .)
I believe the answer is:
erase
(Other definitions for erase that I've seen before include "Remove all traces of" , "Take out" , "Remove evidence of" , "Remove, wipe out" , "Obliterate" .)