Religious beliefs that could make you go mad (5)
I believe the answer is:
dogma
'religious beliefs that' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'could make you go mad' is the wordplay.
'could make you' indicates an anagram.
'go'+'mad'='gomad'
'gomad' with letters rearranged gives 'DOGMA'.
Can you help me to learn more?
(Other definitions for dogma that I've seen before include "church teaching" , "Some believe it certainly" , "Belief, precept" , "Inflexible principles" , "Body of creed" .)