Crossword Genius

As is proper, stood up for the lady (8)

Ross

I believe the answer is:

primrose

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'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!" .)

I've seen this clue in the Evening Standard.
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