Bright red flower (5)
I believe the answer is:
poppy
'bright red flower' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for poppy that I've seen before include "Scarlet flower worn in Remembrance" , "Bright red flower, source of opium" , "Remembrance Day flower" , "Wild flower having its day in November" , "Flower of cornfields" .)