Cruel, a Parisian child nicking note (6)

I believe the answer is:

unkind

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'cruel' is the definition.
('unkind' can be a synonym of 'cruel')

I can't explain the rest of the clue.

(Other definitions for unkind that I've seen before include "Not sympathetic" , "Not gentle or considerate" , "Unsympathetic or cruel" , "Heartless, brutal" , "Inconsiderate or harsh towards others" .)

I've seen this clue in The Telegraph.

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