A book: Down and Out in Paris and London? (1,4,2,3,6)
I believe the answer is:
a tale of two cities
I believe this clue is a double definition.
'a book' is the first definition.
(Charles Dickens novel)
'down and out in paris and london?' is the second definition.
(I've seen this before)
(Other definitions for a tale of two cities that I've seen before include "Dickens novel (1,4,2,3,6)" , "Down and Out in Paris and London" , "* [DICKENS WORK]" .)