Book overseas trip (1,7,2,5)
I believe the answer is:
a passage to india
'book' is the definition.
(novel by EM Forster)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for a passage to india that I've seen before include "E.M. Forster novel" , "Book" , "taken by hippies seeking guru?" , "a journey that ends up in the subcontinent" , "Novel's" .)