Clue: Book date with lover, say? Memory's useful for that (8,6)
Answer: TRISTRAM SHANDY
Explanation: Book date with lover, say? Memory's useful for that (8,6)
Homophone of **TRYST** ("meeting with lover", *say*) +** RAM'S** (random access "memory's") + **HANDY** ( "useful") 
*The full title of Laurence Sterne's famous novel was "The Life and Opinions of Tristram Shandy, Gentleman", but it is normally called "Tristram Shandy"