Clue: Coxed pair booked? (5,3,2,1,4)
Answer: THREE MEN IN A BOAT
Explanation: Coxed pair booked? (5,3,2,1,4)
A coxed pair would be "three men in a boat". 
*"Three Men in a Boat" (1889) by Jerome K Jerome is the source of one of my favourite quotes – "I like work; it fascinates me. I can sit and look at it for hours"