Coffee house ultimately very much occupied by journalists (8)
I believe the answer is:
espresso
'coffee' is the definition.
(espresso is a kind of coffee)
'house ultimately very much occupied by journalists' is the wordplay.
'ultimately' says to take the final letters.
'very much' becomes 'so'.
'occupied by' means one lot of letters goes inside another.
'journalists' becomes 'press' (I've seen this before).
The final letter of 'house' is 'e'.
'so' enclosing 'press' is 'spresso'.
'e'+'spresso'='ESPRESSO'
(Other definitions for espresso that I've seen before include "Coffee-making machine" , "Drinks machine" , "This may keep someone awake!" , "Barista's beverage" , "Coffee drink" .)