Flower from the Emerald Isle? Not quite! (4)
I believe the answer is:
iris
'flower' is the definition.
(thesaurus)
'from the emerald isle? not quite' is the wordplay.
'from the emerald isle?' becomes 'irish' (I've seen this before).
'not quite' means to remove the last letter.
'irish' with its final letter taken off is 'IRIS'.
(Other definitions for iris that I've seen before include "- - Murdoch, novelist" , "Bright flower or eye part" , "Pupil is at the centre of this" , "Flag or flower in the eye" , "who keeps pupil in?" .)