Turn up to give church shade (4)
I believe the answer is:
puce
'shade' is the definition.
(I've seen this before)
'turn up to give church' is the wordplay.
'turn' says the letters should be written in reverse.
'to give church' becomes 'ce' (I can't explain this - if you can you should believe this answer much more).
'up' backwards is 'pu'.
'pu'+'ce'='PUCE'
Can you help me to learn more?
(Other definitions for puce that I've seen before include "Brownish-purple colour" , "Purplish-brown colour" , "Deep red to brownish purple" , "Pinkish purple" , "Shade" .)