Popular medic attempts endlessly to take in new teaching (8)

I believe the answer is:

doctrine

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'teaching' is the definition.
(doctrine is a kind of teaching)

'popular medic attempts endlessly to take in new' is the wordplay.
'popular medic' becomes 'doc' (doctor. I am not sure about the 'popular' bit.).
'attempts' becomes 'tries' ('try' can be a synonym of 'attempt').
'endlessly' means to remove the last letter.
'to take in' indicates putting letters inside.
'new' becomes 'n' (abbreviation as in New Testament NT).
'tries' with its last letter removed is 'trie'.
'trie' placed around 'n' is 'trine'.
'doc'+'trine'='DOCTRINE'

Can you help me to learn more?

(Other definitions for doctrine that I've seen before include "Set of religious principles" , "On credit (anag.)" , "System of beliefs" , "Dogma" , "No credit given to belief" .)

I've seen this clue in The Times.

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