Inaccessible? Some doctrine — to me — rates being sent up! (6)
I believe the answer is:
remote
'inaccessible?' is the definition.
('remote' can be similar in meaning to 'inaccessible')
'some doctrine to me rates being sent up' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'being sent up' is a reversal indicator.
'etomer' is hidden in the letters of 'doctrine to me rates'.
'etomer' back-to-front is 'REMOTE'.
(Other definitions for remote that I've seen before include "Far away in place; slight" , "Unlikely" , "Slight possibility" , "rather aloof" , "Distant like meteor (6)" .)