Writer about drink (8)
I believe the answer is:
reporter
'writer' is the definition.
(I know that reporter is a type of journalist)
'about drink' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'drink' becomes 'porter' (porter is a kind of drink).
're'+'porter'='REPORTER'
(Other definitions for reporter that I've seen before include "Newshound" , "Journo" , "News person" , "He gives details" , "hacker?" .)