Autumn blossom (5)
I believe the answer is:
aster
'autumn blossom' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aster that I've seen before include "Large daisy" , "It grows" , "Stare oddly at the flower" , "Showy garden flower" , "Flower of the daisy family - rates (anag)" .)