Crossword Genius

Start of last month turning very chilly (4)

Ross

I believe the answer is:

iced

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But I can't explain it at all! Could you help me understand?

(Other definitions for iced that I've seen before include "What cake might be" , "Covered with flavoured sugar topping" , "reduced number of degrees" , "Kept cool" , "Glazed" .)

I've seen this clue in The Times.
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