5 down
On which it’s cold and bitter after temperature in liquid decreasing? (10,5)
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How the clue works
This is an &lit where the whole clue both defines and provides the wordplay. Take T (temperature) inside an anagram of "decreasing" (the anagram indicator being "liquid") to get CENTIGRADES, then add C (cold) and ALE (bitter) to finish with CENTIGRADE SCALE — which is indeed the thing on which "cold" sits at the bitter end.