Crossword Genius

Naughty pupils showing ill manners (3,4)

Ross

I believe the answer is:

bad form

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'naughty pupils' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'ill manners' is the wordplay.
'ill' becomes 'bad' (similar in meaning).
'manners' becomes 'form' (I am not sure about this - if you are sure you should believe this answer much more).
'bad'+'form'='BAD FORM'

'showing' is the link.

Can you help me to learn more?

(Other definitions for bad form that I've seen before include "Offending against conventions" , "Breach of social conventions" , "Poor behaviour or school class of duffers" , "unruly class" , "Reprehensible conduct" .)

I've seen this clue in The Sun.
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