Crossword Genius

Piece of one’s mind – all contents of shell-like? (6)

Ross

I believe the answer is:

earful

(Other definitions for earful that I've seen before include "Informally, a lot of talk, maybe a reprimand" , "Ticking-off" , "Rocket" , "Prolonged reprimand (colloq.)" , "Get this and you listen to a lot" .)

I've seen this clue in The Guardian.
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