Clue: A final piece of wallpaper, endless rolls around next to Mark, he finished off layer upon layer (7,7)
Answer: COLONEL SANDERS
Explanation: Definition: he finished off layer upon layer
A charade of COLON (mark') plus ELSANDERS, an anagram ('rolls around') of 'a' plus R ('final piece of wallpape**R**') plus 'endless', for the founder of Kentucky Fried Chicken.