Canine with old woman shows blind faith (5)
I believe the answer is:
dogma
'blind faith' is the definition.
(I've seen this before)
'canine with old woman' is the wordplay.
'canine' becomes 'dog' (dog is a kind of canine).
'with' says to put letters next to each other.
'old woman' becomes 'ma' (both can mean someone's mother).
'dog'+'ma'='DOGMA'
'shows' is the link.
(Other definitions for dogma that I've seen before include "Doctrine laid down with authority" , "Doctrine accepted without question" , "Code of belief" , "Incontrovertible set of principles" , "Inflexible principle" .)