Plain words about a border flower (8)

I believe the answer is:

primrose

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'flower' is the definition.
(I've seen this before)

'plain words about a border' is the wordplay.
'plain words' becomes 'prose' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'a border' becomes 'rim' (both can mean an edge).
'prose' going around 'rim' is 'PRIMROSE'.

Can you help me to learn more?

(Other definitions for primrose that I've seen before include "Early spring flower" , "grows wild" , "Pale yellow- a primula" , "Woodland plant with yellow flowers in spring" , "Spring woodland flower" .)

I've seen this clue in The Globe and Mail.

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