Drink taken after entrance to Death Valley (4)
I believe the answer is:
dale
'valley' is the definition.
(I know that Dale is a type of valley)
'drink taken after entrance to death' is the wordplay.
'drink' becomes 'ale' (type of beer).
'taken after' means one lot of letters go next to another.
'entrance to' indicates taking the first letters.
The first letter of 'death' is 'd'.
'ale' after 'd' is 'DALE'.
(Other definitions for dale that I've seen before include "Valley; old radio soap family" , "Lead into poetic valley" , "Low ground" , "See 8" , "An English valley" .)