Complaint as green card partly withdrawn (4)
I believe the answer is:
acne
'complaint' is the definition.
(acne is a kind of disease)
'green card partly withdrawn' is the wordplay.
'partly' indicates a hidden word (part of the clue is used).
'withdrawn' shows that the letters should be reversed in order.
'enca' is hidden in the letters of 'green card'.
'enca' reversed gives 'ACNE'.
'as' acts as a link.
(Other definitions for acne that I've seen before include "Problem to face in" , "sort of disease" , "Skin complaint" , "Teenage skin blemish" , "Pimply ailment of adolescnce" .)