Cheeky whippersnapper — Japan's cake (anag) (10)

I believe the answer is:

jackanapes

(Other definitions for jackanapes that I've seen before include "Cheeky chappie" , "Cheeky sort" , "Cheeky kid - Japan's cake (anag)" , "Conceited, impertinent person" , "Someone unimportant but cheeky and presumptuous" .)

I've seen this clue in The Guardian.

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