Cushion for kneeling (7)
I believe the answer is:
hassock
'cushion for kneeling' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hassock that I've seen before include "Grass" , "Church cushion" , "Church kneeler" , "Kneeling cushion" , "Cushioned footstool" .)