Crossword Genius

One who criticises another unsparingly (5,5)

Ross

I believe the answer is:

dutch uncle

(Other definitions for dutch uncle that I've seen before include "who speaks frankly?" , "Severe critic" , "one giving a right earful" , "Someone giving firm and frank but good advice" , "One firmly but kindly advising" .)

I've seen this clue in The Telegraph.
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