Discipline Charlie then, as wicked (7)
I believe the answer is:
chasten
'discipline' is the definition.
(I've seen this in another clue)
'charlie then as wicked' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'wicked' indicates anagramming the letters.
'then'+'as'='thenas'
'thenas' with letters rearranged gives 'hasten'.
'c'+'hasten'='CHASTEN'
(Other definitions for chasten that I've seen before include "Suppress" , "Subdue - a stench (anag)" , "Moderate" , "Subdue pride of with a stench" , "Castigate or punish" .)