Crossword Genius

Extreme coldness of nice sis changed for the worse (7)

Ross

I believe the answer is:

iciness

'extreme coldness' is the definition.

'nice sis changed for the worse' is the wordplay.
'changed for the worse' indicates an anagram (a worse spelling of the original letters).
'nice'+'sis'='nicesis'
'nicesis' with letters rearranged gives 'ICINESS'.

'of' is the link.

(Other definitions for iciness that I've seen before include "Hostility, unfriendliness" , "Hostile or cold nature" , "Chill; reserve" , "Extreme cold" , "Hostile attitude" .)

I've seen this clue in The Guardian.
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