The term TIM OF 'ROB ROY' is referring to the character Timothy 'Tib' O'Hara, who is a supporting character in the novel Rob Roy by Sir Walter Scott. He is a young Irishman who is a friend of the protagonist, Frank Osbaldistone. Tib is a loyal companion and helps Frank throughout his journey. The crossword solution for this term is ROTH, which is an abbreviation of the author's last name, Scott.