Crossword Genius

Son, naughty boy, left school a dunce (9)

Ross

I believe the answer is:

simpleton

'a dunce' is the definition.
(I've seen this before)

'son naughty boy left school' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'naughty boy' becomes 'imp' (imp can mean a misbehaving child).
'left' becomes 'l' (common abbreviation).
'school' becomes 'eton' (famous UK public school).
's'+'imp'+'l'+'eton'='SIMPLETON'

(Other definitions for simpleton that I've seen before include "Fool" , "Dope" , "Natural" , "Foolish or gullible person" , "Halfwit" .)

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.