Crossword Genius

Caught hiding in sand, one never learns (5)

Ross

I believe the answer is:

dunce

(Other definitions for dunce that I've seen before include "Proverbially slow learner" , "Poor scholar, slow at learning" , "Unkind word for slow learner" , "Blockhead" , "Idiot" .)

I've seen this clue in The Sun.
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