At the rest centre, journalists have nothing but coffee (8)
I believe the answer is:
espresso
'coffee' is the definition.
(I know that espresso is a type of coffee)
'at the rest centre journalists have nothing' is the wordplay.
'at' says to put letters next to each other.
'centre' means to look at the middle letters.
'journalists' becomes 'press' (the press can mean the newspaper industry).
'have' is a charade indicator (letters next to each other).
'nothing' becomes 'O' (looks like zero - 0).
The middle letters of 'rest' are 'es'.
'es' put next to 'press' is 'espress'.
'espress'+'o'='ESPRESSO'
'but' is the link.
(Other definitions for espresso that I've seen before include "Drinks machine" , "Coffee made by forcing steam through grounds" , "that's stimulating" , "Strong black coffee" , "Kind of shot" .)