Green victory in Europe attainable (9)
I believe the answer is:
vegetable
'green' is the definition.
(eat your greens)
'victory in europe attainable' is the wordplay.
'victory in europe' becomes 'VE' (abbreviation as in 'VE Day').
'attainable' becomes 'getable' (able to be got or attained).
've'+'getable'='VEGETABLE'
(Other definitions for vegetable that I've seen before include "lady's finger, say" , "Food plant" , "Plant with edible parts" , "Such as 11 ac" , "Leek?" .)