“Flower’s edge” in non-poetic writing (8)
I believe the answer is:
primrose
'flower's' is the definition.
(I've seen this before)
'edge in non-poetic writing' is the wordplay.
'edge' becomes 'rim' (rim is a kind of edge).
'in' is an insertion indicator.
'non poetic writing' becomes 'prose' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rim' placed within 'prose' is 'PRIMROSE'.
Can you help me to learn more?
(Other definitions for primrose that I've seen before include "Spring woodland flower" , "Yellowish" , "Early spring flower" , "Yellow spring flower from promiser" , "Pale yellow- a primula" .)