Puppy feeder perhaps in principle? (5)
I believe the answer is:
dogma
'principle?' is the definition.
(I know that dogma is a type of principle)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for dogma that I've seen before include "Belief, precept" , "Code of beliefs accepted as authoritative" , "Body of creed" , "Firm doctrine" , "Inflexible principle" .)