Shade turns up at church (4)
I believe the answer is:
puce
'shade' is the definition.
(I know that puce is or was a shade)
'turns up at church' is the wordplay.
'turns up' is a reversal indicator.
'at' becomes 'up' (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).
'up' in reverse letter order is 'pu'.
'pu'+'ce'='PUCE'
Can you help me to learn more?
(Other definitions for puce that I've seen before include "Pinkish purple" , "Deep red to brownish purple" , "Dark red or purple-brown colour" , "Purplish-brown colour" , "Purplish colour" .)