The most common and most likely answer to this crossword clue is the 6 letter word STOWED
I've seen this crossword clue in Financial Times
S
T
O
W
E
D
Buddy explains!
The straight part
We know that "in luggage compartment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in luggage compartment = stowed.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 STOWED mean?
STOWED verb- To put something away in a compact and tidy manner, in its proper place, or in a suitable place.
- To store or pack something in a space-saving manner and over a long time.
- To arrange, pack, or fill something tightly or closely.
- To dispose, lodge, or hide somebody somewhere.