The most common and most likely answer to this crossword clue is the 5 letter word HOSTA
I've seen this crossword clue in The Guardian
H
O
S
T
A
More clues leading to the result HOSTA
Buddy explains!
The straight part
We know that "that’s found in bed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that’s found in bed = hosta.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 HOSTA mean?
HOSTA noun- Any of several herbaceous Asiatic plants of the genus Hosta.