Flowers in roses I rightly pulled up (6)
I believe the answer is:
irises
'flowers' is the definition.
(I've seen this before)
'in roses i rightly pulled up' is the wordplay.
'in' indicates the answer is hidden within the clue.
'pulled up' says the letters should be written backwards.
'sesiri' is hidden within 'roses i rightly'.
'sesiri' back-to-front is 'IRISES'.
(Other definitions for irises that I've seen before include "Flags" , "Flowers found in the eye" , "Expensive painting" , "Is sire in favour of flowers?" , "Coloured membranes in eyes, or showy flowers" .)