The most common and most likely answer to this crossword clue is the 9 letter word FOOTBOARD
I've seen this crossword clue in Financial Times
F
O
O
T
B
O
A
R
D
Buddy explains!

The straight part
We know that "part of bed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of bed = footboard.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 FOOTBOARD mean?
FOOTBOARD noun- An upright board across the foot of a bedstead.
- A board or small raised platform on which to support or rest the feet, such as that found in a carriage.
- A place to stand on a scooter or skateboard.