Rank inside green bottles (6)
I believe the answer is:
degree
'rank' is the definition.
(synonyms)
'inside green bottles' is the wordplay.
'bottles' says the answer is hidden in the clue (bottling is a kind of containing).
'DEGREE' is hidden in the letters of 'inside green'.
(Other definitions for degree that I've seen before include "Comparative amount" , "Unit of temperature and college award" , "Graduate's qualification" , "'Grade, step or award (6)'" , "Scholastic award for a grade on a scale" .)