In a canine expert, see member of Christian group (9)
I believe the answer is:
adventist
'member of christian group' is the definition.
'adventist' can be an answer for 'member' (I have seen 'member of cult' mean 'adventist' so perhaps 'member' could also mean 'adventist'). I'm not certain of the 'of christian group' bit.
'in a canine expert see' is the wordplay.
'in' means one lot of letters goes inside another.
'canine expert' becomes 'dentist' (I can't explain this - if you can you should believe this answer much more).
'see' becomes 'v' (short for 'vide', Latin meaning 'see elsewhere').
'a'+'dentist'='adentist'
'adentist' going around 'v' is 'ADVENTIST'.
Can you help me to learn more?
(Other definitions for adventist that I've seen before include "member of cult" , "Sectarian" , "who looks for golden age?" .)