The most common and most likely answer to this crossword clue is the 9 letter word BACKSIDES
I've seen this crossword clue in The Times
B
A
C
K
S
I
D
E
S
Buddy explains!
The straight part
We know that "Some maybe in seats" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some maybe in seats = backsides.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 BACKSIDES mean?
BACKSIDES noun- The back side of anything, the part opposite its front, particularly:
- The reverse or opposite of anything.