Green Party, following article, nearly outspoken (7)
I believe the answer is:
avocado
'green' is the definition.
(shade of green)
'party following article nearly outspoken' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'following' is a charade indicator (letters next to each other).
'article' becomes 'a' (the indefinite article in English).
'nearly' means to remove the last letter.
'outspoken' becomes 'vocal' (synonyms).
'vocal' with its final letter taken away is 'voca'.
'a'+'voca'='avoca'
'do' after 'avoca' is 'AVOCADO'.
(Other definitions for avocado that I've seen before include "Evergreen" , "Green - fruit eaten as a vegetable" , "Light green; fruit" , "Shade of green" , "Blackish- or yellowish-green colour" .)