In centre, prepares press officer a drink (8)
I believe the answer is:
espresso
'a drink' is the definition.
(espresso is a kind of drink)
'in centre prepares press officer' is the wordplay.
'in centre' indicates the answer is hidden within the clue (I've seen 'in centre of' mean this).
'ESPRESSO' is hidden in the letters of 'prepares press officer'.
(Other definitions for espresso that I've seen before include "Italian-style coffee" , "Seep Ross into the coffee" , "Strong coffee made with steam machine" , "Coffee made under steam pressure" , "Coffee drink" .)