Daisy, maiden to maintain religious procedure (10)
I believe the answer is:
marguerite
'daisy' is the definition.
(I've seen this before)
'maiden to maintain religious procedure' is the wordplay.
'maiden' becomes 'm' (cricket abbreviation).
'to maintain' becomes 'argue' (I've seen this in another clue).
'religious procedure' becomes 'rite' (I have seen 'Ceremonial procedure' mean 'rite' so perhaps 'procedure' could also mean 'rite'. I am not sure about the 'religious' bit.).
'm'+'argue'+'rite'='MARGUERITE'
Can you help me to learn more?
(Other definitions for marguerite that I've seen before include "plant" , "Flower" , "Daisy" , "Girl" .)