Discipline little Charles at an early age (7)
I believe the answer is:
chasten
'discipline little' is the definition.
'chasten' can be an answer for 'discipline' (I've seen this in another clue). I'm not certain of the 'little' bit.
'charles at an early age' is the wordplay.
'charles' becomes 'Chas' (shortened form).
'at' means one lot of letters go next to another.
'an early age' becomes 'ten' (ten years old is an age. I am not sure about the 'early' bit.).
'chas'+'ten'='CHASTEN'
Can you help me to learn more?
(Other definitions for chasten that I've seen before include "Subdue - a stench (anag)" , "Moderate" , "Suppress" , "Subdue, correct by punishing" , "Have a restraining effect on (someone)" .)