Drink running water with live newt further up (4,3)
I believe the answer is:
beef tea
'drink' is the definition.
(I've seen this before)
'running water with live newt further up' is the wordplay.
'running water' becomes 'ea' (regional dialect term for a river).
'with' means one lot of letters go next to another.
'live' becomes 'be' (synonyms).
'newt' becomes 'eft' (eft is a kind of newt).
'further up' means one lot of letters go next to another (in a down clue, some letters go above others).
'be' put next to 'eft' is 'beeft'.
'ea' put after 'beeft' is 'BEEF TEA'.
(Other definitions for beef tea that I've seen before include "Savoury drink" , "Hot drink made with meat" , "Meat solution for invalids" , "Juice from stewed meat for invalids" , "Drink made from boiled meat" .)