As is proper, stood up for the lady (8)
I believe the answer is:
primrose
'the lady' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'as is proper stood up' is the wordplay.
'as is proper' becomes 'prim' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stood up' becomes 'rose' (I've seen this in other clues).
'prim'+'rose'='PRIMROSE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for primrose that I've seen before include "grows wild" , "Pale yellow flower" , "Yellow spring flower from promiser" , "Rip morse up to find the flower" , "something in the bed!" .)