Misfit with unappreciated potential (4,8)

I believe the answer is:

ugly duckling

(Other definitions for ugly duckling that I've seen before include "Bird in H. C. Andersen story" , "Cygnet (in the story)" , "Hans Christian Andersen cygnet" , "one succeeding against expectation" , "Swan as unpromising youngster" .)

I've seen this clue in The Wall Street Journal.

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