Surprising, if such a brightly flowering plant (7)
I believe the answer is:
fuchsia
'brightly flowering plant' is the definition.
'fuchsia' can be an answer for 'plant' (type of shrub). I am unsure of the 'brightly flowering' bit.
'surprising if such a' is the wordplay.
'surprising' indicates anagramming the letters.
'if'+'such'='ifsuch'
'ifsuch' with letters rearranged gives 'fuchsi'.
'fuchsi'+'a'='FUCHSIA'
Can you help me to learn more?
(Other definitions for fuchsia that I've seen before include "Flower; colour" , "Ornamental flowering plant - reddish-purple" , "Pinkish-purple" , "Pendulous-flowered shrub" , "If such a plant is a showy flower" .)