Wine amazingly clear at temperature (6)
I believe the answer is:
claret
'wine' is the definition.
(claret is a kind of wine)
'amazingly clear at temperature' is the wordplay.
'amazingly' indicates anagramming the letters.
'at' is a charade indicator (letters next to each other).
'temperature' becomes 't' (abbreviation).
'clear' is an anagram of 'clare'.
'clare'+'t'='CLARET'
(Other definitions for claret that I've seen before include "Wine from the Bordeaux region" , "Alcohol" , "Red wine from southern France" , "Dry red wine of Bordeaux" , "Purplish-red - blood" .)