Grant Church is showing attitude (6)
I believe the answer is:
stance
'showing attitude' is the definition.
'stance' can be an answer for 'attitude' (stance is a kind of attitude). I am not certain of the 'showing' bit.
'grant church' is the wordplay.
'grant' becomes 'stan' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'church' becomes 'CE' (abbreviation for Church of England).
'stan'+'ce'='STANCE'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for stance that I've seen before include "Posture, standing position" , "Position assumed by upright person" , "Bearing" , "Posture assumed" , "One's physical or mental attitude" .)