Purple flowers (6)
I believe the answer is:
irises
'purple flowers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for irises that I've seen before include "Parts of eyes or flowering plants" , "Eye membranes or showy flowers." , "Flowers found in the eye" , "Plants with sword-shaped leaves" , "Expensive painting" .)