The most common and most likely answer to this crossword clue is the 9 letter word OVERLADEN
I've seen this crossword clue in The Guardian
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More clues leading to the result OVERLADEN
- Accomplished youth takes directions, having too much to carry
- In the past, US city retreat charged too much
- Excessively burdened concerning the French office
- Maiden possibly left port with too much luggage
- Jam-packed deliveries left Yemen port
- Finish line, port has too much cargo
- Under too much pressure as dead criminal retreats to hideout!
- Carrying too much? Load never varied
Buddy explains!

The straight part
We know that "with too much luggage" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with too much luggage = overladen.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 OVERLADEN mean?
OVERLADEN adjective- Packed heavily, especially beyond normal capacity; overloaded.
- Burdened excessively.
- To load with too great a cargo or other burden; overburden; overload.