The crossword solution for the term 'DISREPUTABLE CHAP' is CAD, which stands for Chief Architectural Designer. A Chief Architectural Designer is a professional who is responsible for designing and overseeing the construction of buildings and other structures. They are also responsible for ensuring that the design meets all safety and building codes. The term 'disreputable chap' implies that the individual in question is not trustworthy or reliable, which could be a reflection of their work as a Chief Architectural Designer.