Plant with showy flowers (4)
I believe the answer is:
iris
'plant with showy flowers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for iris that I've seen before include "Goddess of the rainbow in the eye" , "Flag - surrounding pupil" , "Circular coloured membrane in the eye" , "Flag - flower - girl" , "Flag,flower and part of the eye" .)