Casual attitude of church fellow in north once (11)
I believe the answer is:
nonchalance
'casual attitude' is the definition.
(nonchalance is calmness or lack of concern)
'church fellow in north once' is the wordplay.
'church fellow' becomes 'chalan' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'north' becomes 'N' (abbreviation).
'n'+'once'='nonce'
'chalan' inserted into 'nonce' is 'NONCHALANCE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for nonchalance that I've seen before include "Calm disposition" , "Casual unconcern" , "Coolness; indifference" , "Casual calmness" , "Casually calm relaxed attitude" .)