Artist and writer among group trying not to drink coffee, potentially (7)
I believe the answer is:
arabica
'coffee potentially' is the definition.
(Arabica is a variety of coffee)
'artist and writer among group trying not to drink' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'and' means one lot of letters go next to another.
'writer' becomes 'bic' (kind of pen).
'among' means one lot of letters goes inside another.
'group trying not to drink' becomes 'aa' (short for Alcoholics Anonymous).
'ra'+'bic'='rabic'
'rabic' placed within 'aa' is 'ARABICA'.
(Other definitions for arabica that I've seen before include "Type of coffee bean" , "hot beverage" , "Variety of coffee beans" , "Variety of coffee bean" , "African tree cultivated for coffee" .)