Chris Lambert keeps faith (5)
I believe the answer is:
islam
'faith' is the definition.
(Islam is an example)
'chris lambert keeps' is the wordplay.
'keeps' indicates a hidden word.
'ISLAM' can be found hidden inside 'chris lambert'.
(Other definitions for islam that I've seen before include "Adherents of a religion" , "Mails to great eastern religion" , "Monotheistic religion" , "Koran its scripture" , "Faith with five pillars" .)