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Bitter personal description of one issuing reprimands, reportedly (3-4)

Ross

I believe the answer is:

ice-cold

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'bitter' is the definition.
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(Other definitions for ice-cold that I've seen before include "Chilled" , "Freezing" , ". . . . . . . in Alex (film)" , "Frozen" , "Straight from the freezer" .)

I've seen this clue in The Telegraph.
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