Large showy flower (8)
(Other definitions for hibiscus that I've seen before include "Genus of mostly tropical plants" , "Large-flowered plant of the mallow family" , "His cubs I change for a fragrant flower" , "Malaysian national symbol" , "The rose mallow" .)
'large showy flower' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for peony that I've seen before include "Bloom" , "Herbaceous flower" , "Garden flower" , "Plant with large red, white or pink flowers" .)