The most common and most likely answer to this crossword clue is the 7 letter word KNEELER
I've seen this crossword clue in The Guardian
K
N
E
E
L
E
R
More clues leading to the result KNEELER
Buddy explains!

The straight part
We know that "cushion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cushion = kneeler.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 KNEELER mean?
KNEELER noun- A person who kneels.
- A thing that is designed to be kneeled on.
- An apparatus that permits the loading door of a bus to decrease in height in order to facilitate boarding of passengers that are seniors and physically disadvantaged
- On a gable-end, the stone (often decorated) at the base of the slope of the gable on either side.