Cryptic crossword clue
Back seat of auto's bouncing carrying nine — one got tossed out 7

The most common and most likely answer to this crossword clue is the 7 letter word TONNEAU

T
O
N
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A
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Buddy explains!

The straight part
We know that "Back seat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case back seat = tonneau.
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 TONNEAU mean?

TONNEAU noun
  1. The rear body or compartment of some types of motor vehicle, especially one containing seats for passengers.
  2. An old-style open passenger vehicle with a tonneau (rear compartment with seats).
TONNEAU noun
  1. A protective covering which may be secured over the exposed portion of a motor vehicle, such as the seating area of an open sports car or the back of a pickup truck.

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