Little Charles gets a number correct (7)
I believe the answer is:
chasten
'correct' is the definition.
('chasten' can be a synonym of 'correct')
'little charles gets a number' is the wordplay.
'little' says to take the initial letters.
'gets' becomes 'has' (having is a kind of getting).
'a number' becomes 'ten' (ten is a kind of number).
The first letter of 'charles' is 'c'.
'c'+'has'+'ten'='CHASTEN'
(Other definitions for chasten that I've seen before include "Subdue pride of with a stench" , "Have a restraining effect on (someone)" , "Moderate" , "Censure severely" , "Castigate or punish" .)