Cheeky little devil — pupil chucking stone (8)
I believe the answer is:
impudent
'cheeky' is the definition.
(I've seen this before)
'little devil pupil chucking stone' is the wordplay.
'little devil' becomes 'imp' (I've seen this before).
'pupil' becomes 'student' (synonyms).
'chucking' indicates named letters should be taken away.
'stone' becomes 'st'.
'student' with 'st' removed is 'udent'.
'imp'+'udent'='IMPUDENT'
(Other definitions for impudent that I've seen before include "impolite" , "Cheeky, disrespectful" , "Saucy" , "Impertinent, insolent" , "orward" .)