Cryptic crossword clue
Engine to drive Jack over Egypt on vacation 6

The most common and most likely answer to this crossword clue is the 6 letter word RAMJET

I've seen this crossword clue in The Guardian
R
A
M
J
E
T

Buddy explains!

The straight part
We know that "Engine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case engine = ramjet.
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.

What does RAMJET mean?

RAMJET noun
  1. A jet engine in which forward motion forces air into an inlet, compressing it (as opposed to having a pump type device compressing the air for combustion with fuel), and where combustion is subsonic.

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