I almost grow flower (4)
I believe the answer is:
iris
'flower' is the definition.
(iris is a type of flower)
'i almost grow' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'grow' becomes 'rise' (rising is a kind of growing).
'rise' with its final letter taken off is 'ris'.
'i'+'ris'='IRIS'
(Other definitions for iris that I've seen before include "bloomer?" , "Murdoch in writing" , "Flag,flower and part of the eye" , "Circular coloured membrane in the eye" , "Flower - girl's name" .)