Commodity box not popular with central Greece (6)
I believe the answer is:
coffee
'commodity box' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'not popular with central greece' is the wordplay.
'not popular' becomes 'coff' (I am not sure about this - if you are sure you should believe this answer much more).
'with' means one lot of letters go next to another.
'central' means to look at the middle letters.
The middle letters of 'greece' are 'ee'.
'coff'+'ee'='COFFEE'
Can you help me to learn more?
(Other definitions for coffee that I've seen before include "Eg, espresso" , "Drink from 19s" , "Cappuccino or espresso, say" , "Hot drink" , "Aromatic table drink" .)