A basis for prayers (4-4)
I believe the answer is:
prie-dieu
'a basis for prayers' is the definition.
(item of furniture which praying people kneel on)
This is all the clue.
(Other definitions for prie-dieu that I've seen before include "On which to kneel and pray" , "Item of furniture used for praying" , "Piece of furniture used in praying" , "I'd 1 rupee (anag) - prayer desk" , "It's knelt on for prayer" .)