Czech region banning motorway drink (5)
I believe the answer is:
bohea
'drink' is the definition.
(I know that bohea is a type of tea)
'czech region banning motorway' is the wordplay.
'czech region' becomes 'bohemia' (Bohemia is part of the Czech Republic).
'banning' is a deletion indicator.
'motorway' becomes 'MI' (resembles M1, English motorway).
'bohemia' with 'mi' removed is 'BOHEA'.
(Other definitions for bohea that I've seen before include "Black Chinese tea" , "Variety of black China tea" , "Type of tea" , "Bowl-shaped aerial" , "Low-quality black China tea" .)