David —, host of 1960s BBC TV satire show That Was the Week That Was (5)

I believe the answer is:

frost

(Other definitions for frost that I've seen before include "Ice forming in cold weather" , "Icy condensation" , "RD Wingfield's detective" , "Robert ---, US poet" , "Frozen dew" .)

I've seen this clue in The Mirror.

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