Journalists in tea shop regularly drink (8)
I believe the answer is:
espresso
'drink' is the definition.
(espresso is a kind of drink)
'journalists in tea shop regularly' is the wordplay.
'journalists' becomes 'press' (the press can mean the newspaper industry).
'in' means one lot of letters goes inside another.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'tea'+'shop'='teashop'
The alternate letters of 'teashop' are 'eso'.
'press' put within 'eso' is 'ESPRESSO'.
(Other definitions for espresso that I've seen before include "Coffee made by forcing steam through grounds" , "Strong black coffee" , "Italian-style coffee" , "Drinks machine" , "Coffee drink" .)