Harry, graduate, assembled doctrine (5)

I believe the answer is:

dogma

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'doctrine' is the definition.
(I know that dogma is a type of doctrine)

'harry graduate assembled' is the wordplay.
'harry' becomes 'dog' (I've seen this in other clues).
'graduate assembled' becomes 'ma' (abbreviation for Master of Arts. I am not sure about the 'assembled' bit.).
'dog'+'ma'='DOGMA'

Can you help me to learn more?

(Other definitions for dogma that I've seen before include "Belief, precept" , "Doctrine laid down with authority" , "Blind faith required" , "Inflexible principle" , "Inflexible doctrine" .)

I've seen this clue in The Everyman puzzle in The Observer.

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