Pew adjunct (7)
I believe the answer is:
kneeler
'pew adjunct' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kneeler that I've seen before include "Cushion in chuch pew" , "Cushion provided in church" , "Hassock" , "It supports bended joints (in church?)" , "Church pew cushion" .)