The term 'apply wrongly' can be broken down into three crossword solutions: MISUSE (6 letters), MISUSES (7 letters), and DAUB (4 letters). MISUSE is defined as the incorrect or improper use of something, while MISUSES is the plural form of the same word. DAUB is an archaic verb meaning to smear or cover with a thick layer of something. Together, these words suggest that someone is using something in an incorrect or improper way, and covering it up with a thick layer of something else.