Five Pillars faith (5)
I believe the answer is:
islam
'five pillars faith' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for islam that I've seen before include "Religion of the Koran" , "Mails to Muslim religion" , "Adherents of a religion" , "Faith with five pillars" , "Mails to great eastern religion" .)