The most common and most likely answer to this crossword clue is the 4 plus 5 letter word SUEZ CANAL
I've seen this crossword clue in The Daily Telegraph
S
U
E
Z
C
A
N
A
L
More clues leading to the result SUEZ CANAL
- Returning god is able to half- seal waterway
- Preserve a lake after divine leader backed waterway
- Waterway network, one with American backing, around Zambia’s capital
- Returning Greek ruler may walk unclothed in passage
- Girl, the last one to the toilet with a principally leaky water system
- Translation of casual Zen passage
- Tin god starting over on a Latin craft course
- Casual zen deployed in part of Passage to India
Buddy explains!
The straight part
We know that "part of Passage to India" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of passage to india = suez canal.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.